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   [Search Documentation] ____________________ Go

                               Release History

   This page provides a high-level summary of changes to SQLite. For more
   detail, see the Fossil checkin logs at
   http://www.sqlite.org/src/timeline and
   http://www.sqlite.org/src/timeline?t=release. See the chronology a
   succinct listing of releases.

  2021-01-20 (3.34.1)

    1. Fix a potential use-after-free bug when processing a a subquery
       with both a correlated WHERE clause and a "HAVING 0" clause and
       where the parent query is an aggregate.
    2. Fix documentation typos
    3. Fix minor problems in extensions.
       Hashes:
    4. SQLITE_SOURCE_ID: 2021-01-20 14:10:07
       10e20c0b43500cfb9bbc0eaa061c57514f715d87238f4d835880cd846b9ebd1f
    5. SHA3-256 for sqlite3.c:
       799a7be90651fc7296113b641a70b028c142d767b25af1d0a78f93dcf1a2bf20

  2020-12-01 (3.34.0)

    1. Added the sqlite3_txn_state() interface for reporting on the
       current transaction state of the database connection.
    2. Enhance recursive common table expressions to support two or more
       recursive terms as is done by SQL Server, since this helps make
       queries against graphs easier to write and faster to execute.
    3. Improved error messages on CHECK constraint failures.
    4. CLI enhancements:
         a. The .read dot-command now accepts a pipeline in addition to a
            filename.
         b. Added options --data-only and --nosys to the .dump
            dot-command.
         c. Added the --nosys option to the .schema dot-command.
         d. Table name quoting works correctly for the .import
            dot-command.
         e. The generate_series(START,END,STEP) table-valued function
            extension is now built into the CLI.
         f. The .databases dot-command now shows the status of each
            database file as determined by sqlite3_db_readonly() and
            sqlite3_txn_state().
         g. Added the --tabs command-line option that sets .mode tabs.
         h. The --init option reports an error if the file named as its
            argument cannot be opened. The --init option also now honors
            the --bail option.
    5. Query planner improvements:
         a. Improved estimates for the cost of running a DISTINCT
            operator.
         b. When doing an UPDATE or DELETE using a multi-column index
            where only a few of the earlier columns of the index are
            useful for the index lookup, postpone doing the main table
            seek until after all WHERE clause constraints have been
            evaluated, in case those constraints can be covered by unused
            later terms of the index, thus avoiding unnecessary main table
            seeks.
         c. The new OP_SeekScan opcode is used to improve performance of
            multi-column index look-ups when later columns are constrained
            by an IN operator.
    6. The BEGIN IMMEDIATE and BEGIN EXCLUSIVE commands now work even if
       one or more attached database files are read-only.
    7. Enhanced FTS5 to support trigram indexes.
    8. Improved performance of WAL mode locking primitives in cases where
       there are hundreds of connections all accessing the same database
       file at once.
    9. Enhanced the carray() table-valued function to include a
       single-argument form that is bound using the auxiliary
       sqlite3_carray_bind() interface.
   10. The substr() SQL function can now also be called "substring()" for
       compatibility with SQL Server.
   11. The syntax diagrams are now implemented as Pikchr scripts and
       rendered as SVG for improved legibility and ease of maintenance.
       Hashes:
   12. SQLITE_SOURCE_ID: 2020-12-01 16:14:00
       a26b6597e3ae272231b96f9982c3bcc17ddec2f2b6eb4df06a224b91089fed5b
   13. SHA3-256 for sqlite3.c:
       fbd895b0655a337b2cd657675f314188a4e9fe614444cc63dfeb3f066f674514

  2020-08-14 (3.33.0)

    1. Support for UPDATE FROM following the PostgreSQL syntax.
    2. Increase the maximum size of database files to 281 TB.
    3. Extended the PRAGMA integrity_check statement so that it can
       optionally be limited to verifying just a single table and its
       indexes, rather than the entire database file.
    4. Added the decimal extension for doing arbitrary-precision decimal
       arithmetic.
    5. Enhancements to the ieee754 extension for working with IEEE 754
       binary64 numbers.
    6. CLI enhancements:
         a. Added four new output modes: "box", "json", "markdown", and
            "table".
         b. The "column" output mode automatically expands columns to
            contain the longest output row and automatically turns
            ".header" on if it has not been previously set.
         c. The "quote" output mode honors ".separator"
         d. The decimal extension and the ieee754 extension are built-in
            to the CLI
    7. Query planner improvements:
         a. Add the ability to find a full-index-scan query plan for
            queries using INDEXED BY which previously would fail with "no
            query solution".
         b. Do a better job of detecting missing, incomplete, and/or dodgy
            sqlite_stat1 data and generates good query plans in spite of
            the misinformation.
         c. Improved performance of queries like "SELECT min(x) FROM t
            WHERE y IN (?,?,?)" assuming an index on t(x,y).
    8. In WAL mode, if a writer crashes and leaves the shm file in an
       inconsistent state, subsequent transactions are now able to recover
       the shm file even if there are active read transactions. Before
       this enhancement, shm file recovery that scenario would result in
       an SQLITE_PROTOCOL error.
       Hashes:
    9. SQLITE_SOURCE_ID: 2020-08-14 13:23:32
       fca8dc8b578f215a969cd899336378966156154710873e68b3d9ac5881b0ff3f
   10. SHA3-256 for sqlite3.c:
       d00b7fffa6d33af2303430eaf394321da2960604d25a4471c7af566344f2abf9

  2020-06-18 (3.32.3)

    1. Various minor bug fixes including fixes for tickets
       8f157e8010b22af0, 9fb26d37cefaba40, e367f31901ea8700,
       b706351ce2ecf59a, 7c6d876f84e6e7e2, and c8d3b9f0a750a529.
       Hashes:
    2. SQLITE_SOURCE_ID: 2020-06-18 14:00:33
       7ebdfa80be8e8e73324b8d66b3460222eb74c7e9dfd655b48d6ca7e1933cc8fd
    3. SHA3-256 for sqlite3.c:
       b62b77ee1c561a69a71bb557694aaa5141f1714c1ff6cc1ba8aa8733c92d4f52

  2020-06-04 (3.32.2)

    1. Fix a long-standing bug in the byte-code engine that can cause a
       COMMIT command report as success when in fact it failed to commit.
       Ticket 810dc8038872e212
       Hashes:
    2. SQLITE_SOURCE_ID: 2020-06-04 12:58:43
       ec02243ea6ce33b090870ae55ab8aa2534b54d216d45c4aa2fdbb00e86861e8c
    3. SHA3-256 for sqlite3.c:
       f17a2a57f7eebc72d405f3b640b4a49bcd02364a9c36e04feeb145eccafa3f8d

  2020-05-25 (3.32.1)

    1. Fix two long-standing bugs that allow malicious SQL statements to
       crash the process that is running SQLite. These bugs were announced
       by a third-party approximately 24 hours after the 3.32.0 release
       but are not specific to the 3.32.0 release.
    2. Other minor compiler-warning fixes and whatnot.
       Hashes:
    3. SQLITE_SOURCE_ID: 2020-05-25 16:19:56
       0c1fcf4711a2e66c813aed38cf41cd3e2123ee8eb6db98118086764c4ba83350
    4. SHA3-256 for sqlite3.c:
       f695ae21abf045e4ee77980a67ab2c6e03275009e593ee860a2eabf840482372

  2020-05-22 (3.32.0)

    1. Added support for approximate ANALYZE using the PRAGMA
       analysis_limit command.
    2. Added the bytecode virtual table.
    3. Add the checksum VFS shim to the set of run-time loadable
       extensions included in the source tree.
    4. Added the iif() SQL function.
    5. INSERT and UPDATE statements now always apply column affinity
       before computing CHECK constraints. This bug fix could, in theory,
       cause problems for legacy databases with unorthodox CHECK
       constraints the require the input type for an INSERT is different
       from the declared column type. See ticket 86ba67afafded936 for more
       information.
    6. Added the sqlite3_create_filename(), sqlite3_free_filename(), and
       sqlite3_database_file_object() interfaces to better support of VFS
       shim implementations.
    7. Increase the default upper bound on the number of parameters from
       999 to 32766.
    8. Added code for the UINT collating sequence as an optional loadable
       extension.
    9. Enhancements to the CLI:
         a. Add options to the .import command: --csv, --ascii, --skip
         b. The .dump command now accepts multiple LIKE-pattern arguments
            and outputs the union of all matching tables.
         c. Add the .oom command in debugging builds
         d. Add the --bom option to the .excel, .output, and .once
            commands.
         e. Enhance the .filectrl command to support the --schema option.
         f. The UINT collating sequence extension is automatically loaded
   10. The ESCAPE clause of a LIKE operator now overrides wildcard
       characters, so that the behavior matches what PostgreSQL does.
   11. SQLITE_SOURCE_ID: 2020-05-22 17:46:16
       5998789c9c744bce92e4cff7636bba800a75574243d6977e1fc8281e360f8d5a
   12. SHA3-256 for sqlite3.c:
       33ed868b21b62ce1d0352ed88bdbd9880a42f29046497a222df6459fc32a356f

  2020-01-27 (3.31.1)

    1. Revert the data layout for an internal-use-only SQLite data
       structure. Applications that use SQLite should never reference
       internal SQLite data structures, but some do anyhow, and a change
       to one such data structure in 3.30.0 broke a popular and
       widely-deployed application. Reverting that change in SQLite, at
       least temporarily, gives developers of misbehaving applications
       time to fix their code.
    2. Fix a typos in the sqlite3ext.h header file that prevented the
       sqlite3_stmt_isexplain() and sqlite3_value_frombind() interfaces
       from being called from run-time loadable extensions.
       Hashes:
    3. SQLITE_SOURCE_ID: 2020-01-27 19:55:54
       3bfa9cc97da10598521b342961df8f5f68c7388fa117345eeb516eaa837bb4d6
    4. SHA3-256 for sqlite3.c:
       de465c64f09529429a38cbdf637acce4dfda6897f93e3db3594009e0fed56d27

  2020-01-22 (3.31.0)

    1. Add support for generated columns.
    2. Add the sqlite3_hard_heap_limit64() interface and the corresponding
       PRAGMA hard_heap_limit command.
    3. Enhance the function_list pragma to show the number of arguments on
       each function, the type of function (scalar, aggregate, window),
       and the function property flags SQLITE_DETERMINISTIC,
       SQLITE_DIRECTONLY, SQLITE_INNOCUOUS, and/or SQLITE_SUBTYPE.
    4. Add the aggregated mode feature to the DBSTAT virtual table.
    5. Add the SQLITE_OPEN_NOFOLLOW option to sqlite3_open_v2() that
       prevents SQLite from opening symbolic links.
    6. Added the "#-N" array notation for JSON function path arguments.
    7. Added the SQLITE_DBCONFIG_TRUSTED_SCHEMA connection setting which
       is also controllable via the new trusted_schema pragma and at
       compile-time using the -DSQLITE_TRUSTED_SCHEMA compile-time option.
    8. Added APIs sqlite3_filename_database(), sqlite3_filename_journal(),
       and sqlite3_filename_wal() which are useful for specialized
       extensions.
    9. Add the sqlite3_uri_key() interface.
   10. Upgraded the sqlite3_uri_parameter() function so that it works with
       the rollback journal or WAL filename in addition to the database
       filename.
   11. Provide the ability to tag application-defined SQL functions with
       new properties SQLITE_INNOCUOUS or SQLITE_DIRECTONLY.
   12. Add new verbs to sqlite3_vtab_config() so that the xConnect method
       of virtual tables can declare the virtual table as
       SQLITE_VTAB_INNOCUOUS or SQLITE_VTAB_DIRECTONLY.
   13. Faster response to sqlite3_interrupt().
   14. Added the uuid.c extension module implementing functions for
       processing RFC-4122 UUIDs.
   15. The lookaside memory allocator is enhanced to support two separate
       memory pools with different sized allocations in each pool. This
       allows more memory allocations to be covered by lookaside while at
       the same time reducing the heap memory usage to 48KB per
       connection, down from 120KB.
   16. The legacy_file_format pragma is deactivated. It is now a no-op. In
       its place, the SQLITE_DBCONFIG_LEGACY_FILE_FORMAT option to
       sqlite3_db_config() is provided. The legacy_file_format pragma is
       deactivated because (1) it is rarely useful and (2) it is
       incompatible with VACUUM in schemas that have tables with both
       generated columns and descending indexes. Ticket 6484e6ce678fffab
       Hashes:
   17. SQLITE_SOURCE_ID: 2020-01-22 18:38:59
       f6affdd41608946fcfcea914ece149038a8b25a62bbe719ed2561c649b86d824
   18. SHA3-256 for sqlite3.c:
       a5fca0b9f8cbf80ac89b97193378c719d4af4b7d647729d8df9c0c0fca7b1388

  2019-10-10 (3.30.1)

    1. Fix a bug in the query flattener that might cause a segfault for
       nested queries that use the new FILTER clause on aggregate
       functions. Ticket 1079ad19993d13fa
    2. Cherrypick fixes for other obscure problems found since the 3.30.0
       release
       Hashes:
    3. SQLITE_SOURCE_ID: 2019-10-10 20:19:45
       18db032d058f1436ce3dea84081f4ee5a0f2259ad97301d43c426bc7f3df1b0b
    4. SHA3-256 for sqlite3.c:
       f96fafe4c110ed7d77fc70a7d690e5edd1e64fefb84b3b5969a722d885de1f2d

  2019-10-04 (3.30.0)

    1. Add support for the FILTER clause on aggregate functions.
    2. Add support for the NULLS FIRST and NULLS LAST syntax in ORDER BY
       clauses.
    3. The index_info and index_xinfo pragmas are enhanced to provide
       information about the on-disk representation of WITHOUT ROWID
       tables.
    4. Add the sqlite3_drop_modules() interface, allowing applications to
       disable automatically loaded virtual tables that they do not need.
    5. Improvements to the .recover dot-command in the CLI so that it
       recovers more content from corrupt database files.
    6. Enhance the RBU extension to support indexes on expressions.
    7. Change the schema parser so that it will error out if any of the
       type, name, and tbl_name columns of the sqlite_master table have
       been corrupted and the database connection is not in
       writable_schema mode.
    8. The PRAGMA function_list, PRAGMA module_list, and PRAGMA
       pragma_list commands are now enabled in all builds by default.
       Disable them using -DSQLITE_OMIT_INTROSPECTION_PRAGMAS.
    9. Add the SQLITE_DBCONFIG_ENABLE_VIEW option for sqlite3_db_config().
   10. Added the TCL Interface config method in order to be able to
       disable SQLITE_DBCONFIG_ENABLE_VIEW as well as control other
       sqlite3_db_config() options from TCL.
   11. Added the SQLITE_DIRECTONLY flag for application-defined SQL
       functions to prevent those functions from being used inside
       triggers and views.
   12. The legacy SQLITE_ENABLE_STAT3 compile-time option is now a no-op.
       Hashes:
   13. SQLITE_SOURCE_ID: 2019-10-04 15:03:17
       c20a35336432025445f9f7e289d0cc3e4003fb17f45a4ce74c6269c407c6e09f
   14. SHA3-256 for sqlite3.c:
       f04393dd47205a4ee2b98ff737dc51a3fdbcc14c055b88d58f5b27d0672158f5

  2019-07-10 (3.29.0)

    1. Added the SQLITE_DBCONFIG_DQS_DML and SQLITE_DBCONFIG_DQS_DDL
       actions to sqlite3_db_config() for activating and deactivating the
       double-quoted string literal misfeature. Both default to "on" for
       legacy compatibility, but developers are encouraged to turn them
       "off", perhaps using the -DSQLITE_DQS=0 compile-time option.
    2. -DSQLITE_DQS=0 is now a recommended compile-time option.
    3. Improvements to the query planner:
         a. Improved optimization of AND and OR operators when one or the
            other operand is a constant.
         b. Enhancements to the LIKE optimization for cases when the
            left-hand side column has numeric affinity.
    4. Added the "sqlite_dbdata" virtual table for extracting raw
       low-level content from an SQLite database, even a database that is
       corrupt.
    5. Improvements to rounding behavior, so that the results of rounding
       binary numbers using the round() function are closer to what people
       who are used to thinking in decimal actually expect.
    6. Enhancements to the CLI:
         a. Add the ".recover" command which tries to recover as much
            content as possible from a corrupt database file.
         b. Add the ".filectrl" command useful for testing.
         c. Add the long-standing ".testctrl" command to the ".help" menu.
         d. Added the ".dbconfig" command
       Hashes:
    7. SQLITE_SOURCE_ID: 2019-07-10 17:32:03
       fc82b73eaac8b36950e527f12c4b5dc1e147e6f4ad2217ae43ad82882a88bfa6
    8. SHA3-256 for sqlite3.c:
       d9a5daf7697a827f4b2638276ce639fa04e8e8bb5fd3a6b683cfad10f1c81b12

  2019-04-16 (3.28.0)

    1. Enhanced window functions:
         a. Add support the EXCLUDE clause.
         b. Add support for window chaining.
         c. Add support for GROUPS frames.
         d. Add support for "<expr> PRECEDING" and "<expr> FOLLOWING"
            boundaries in RANGE frames.
    2. Added the new sqlite3_stmt_isexplain(S) interface for determining
       whether or not a prepared statement is an EXPLAIN.
    3. Enhanced VACUUM INTO so that it works for read-only databases.
    4. New query optimizations:
         a. Enable the LIKE optimization for cases when the ESCAPE keyword
            is present and PRAGMA case_sensitive_like is on.
         b. In queries that are driven by a partial index, avoid
            unnecessary tests of the constraint named in the WHERE clause
            of the partial index, since we know that constraint must
            always be true.
    5. Enhancements to the TCL Interface:
         a. Added the -returntype option to the function method.
         b. Added the new bind_fallback method.
    6. Enhancements to the CLI:
         a. Added support for bound parameters and the .parameter command.
         b. Fix the readfile() function so that it returns an empty BLOB
            rather than throwing an out-of-memory error when reading an
            empty file.
         c. Fix the writefile() function so that when it creates new
            directories along the path of a new file, it gives them umask
            permissions rather than the same permissions as the file.
         d. Change --update option in the .archive command so that it
            skips files that are already in the archive and are unchanged.
            Add the new --insert option that works like --update used to
            work.
    7. Added the fossildelta.c extension that can create, apply, and
       deconstruct the Fossil DVCS file delta format that is used by the
       RBU extension.
    8. Added the SQLITE_DBCONFIG_WRITABLE_SCHEMA verb for the
       sqlite3_db_config() interface, that does the same work as PRAGMA
       writable_schema without using the SQL parser.
    9. Added the sqlite3_value_frombind() API for determining if the
       argument to an SQL function is from a bound parameter.
   10. Security and compatibilities enhancements to fts3_tokenizer():
         a. The fts3_tokenizer() function always returns NULL unless
            either the legacy application-defined FTS3 tokenizers
            interface are enabled using the
            sqlite3_db_config(SQLITE_DBCONFIG_ENABLE_FTS3_TOKENIZER)
            setting, or unless the first argument to fts3_tokenizer() is a
            bound parameter.
         b. The two-argument version of fts3_tokenizer() accepts a pointer
            to the tokenizer method object even without the
            sqlite3_db_config(SQLITE_DBCONFIG_ENABLE_FTS3_TOKENIZER)
            setting if the second argument is a bound parameter
   11. Improved robustness against corrupt database files.
   12. Miscellaneous performance enhancements
   13. Established a Git mirror of the offical SQLite source tree. The
       canonical sources for SQLite are maintained using the Fossil DVCS
       at https://sqlite.org/src. The Git mirror can be seen at
       https://github.com/sqlite/sqlite.
       Hashes:
   14. SQLITE_SOURCE_ID: 2019-04-16 19:49:53
       884b4b7e502b4e991677b53971277adfaf0a04a284f8e483e2553d0f83156b50
   15. SHA3-256 for sqlite3.c:
       411efca996b65448d9798eb203d6ebe9627b7161a646f5d00911e2902a57b2e9

  2019-02-25 (3.27.2)

    1. Fix a bug in the IN operator that was introduced by an attempted
       optimization in version 3.27.0. Ticket df46dfb631f75694
    2. Fix a bug causing a crash when a window function is misused. Ticket
       4feb3159c6bc3f7e33959.
    3. Fix various documentation typos
       Hashes:
    4. SQLITE_SOURCE_ID:
       bd49a8271d650fa89e446b42e513b595a717b9212c91dd384aab871fc1d0f6d7
    5. SHA3-256 for sqlite3.c:
       1dbae33bff261f979d0042338f72c9e734b11a80720fb32498bae9150cc576e7

  2019-02-08 (3.27.1)

    1. Fix a bug in the query optimizer: an adverse interaction between
       the OR optimization and the optimization that tries to use values
       read directly from an expression index instead of recomputing the
       expression. Ticket 4e8e4857d32d401f
       Hashes:
    2. SQLITE_SOURCE_ID: 2019-02-08 13:17:39
       0eca3dd3d38b31c92b49ca2d311128b74584714d9e7de895b1a6286ef959a1dd
    3. SHA3-256 for sqlite3.c:
       11c14992660d5ac713ea8bea48dc5e6123f26bc8d3075fe5585d1a217d090233

  2019-02-07 (3.27.0)

    1. Added the VACUUM INTO command
    2. Issue an SQLITE_WARNING message on the error log if a double-quoted
       string literal is used.
    3. The sqlite3_normalized_sql() interface works on any prepared
       statement created using sqlite3_prepare_v2() or
       sqlite3_prepare_v3(). It is no longer necessary to use
       sqlite3_prepare_v3() with SQLITE_PREPARE_NORMALIZE in order to use
       sqlite3_normalized_sql().
    4. Added the remove_diacritics=2 option to FTS3 and FTS5.
    5. Added the SQLITE_PREPARE_NO_VTAB option to sqlite3_prepare_v3().
       Use that option to prevent circular references to shadow tables
       from causing resource leaks.
    6. Enhancements to the sqlite3_deserialize() interface:
         a. Add the SQLITE_FCNTL_SIZE_LIMIT file-control for setting an
            upper bound on the size of the in-memory database created by
            sqlite3_deserialize. The default upper bound is 1GiB, or
            whatever alternative value is specified by
            sqlite3_config(SQLITE_CONFIG_MEMDB_MAXSIZE) and/or
            SQLITE_MEMDB_DEFAULT_MAXSIZE.
         b. Honor the SQLITE_DESERIALIZE_READONLY flag, which was
            previously described in the documentation, but was previously
            a no-op.
         c. Enhance the "deserialize" command of the TCL Interface to give
            it new "--maxsize N" and "--readonly BOOLEAN" options.
    7. Enhancements to the CLI, mostly to support testing and debugging of
       the SQLite library itself:
         a. Add support for ".open --hexdb". The "dbtotxt" utility program
            used to generate the text for the "hexdb" is added to the
            source tree.
         b. Add support for the "--maxsize N" option on ".open
            --deserialize".
         c. Add the "--memtrace" command-line option, to show all memory
            allocations and deallocations.
         d. Add the ".eqp trace" option on builds with SQLITE_DEBUG, to
            enable bytecode program listing with indentation and PRAGMA
            vdbe_trace all in one step.
         e. Add the ".progress" command for accessing the
            sqlite3_progress_handler() interface.
         f. Add the "--async" option to the ".backup" command.
         g. Add options "--expanded", "--normalized", "--plain",
            "--profile", "--row", "--stmt", and "--close" to the ".trace"
            command.
    8. Increased robustness against malicious SQL that is run against a
       maliciously corrupted database.
       Bug fixes:
    9. Do not use a partial index to do a table scan on an IN operator.
       Ticket 1d958d90596593a774.
   10. Fix the query flattener so that it works on queries that contain
       subqueries that use window functions. Ticket 709fcd17810f65f717
   11. Ensure that ALTER TABLE modifies table and column names embedded in
       WITH clauses that are part of views and triggers.
   12. Fix a parser bug that prevented the use of parentheses around
       table-valued functions.
   13. Fix a problem with the OR optimization on indexes on expressions.
       Ticket d96eba87698a428c1d.
   14. Fix a problem with the LEFT JOIN strength reduction optimization in
       which the optimization was being applied inappropriately due to an
       IS NOT NULL operator. Ticket 5948e09b8c415bc45d.
   15. Fix the REPLACE command so that it is no longer able to sneak a
       NULL value into a NOT NULL column even if the NOT NULL column has a
       default value of NULL. Ticket e6f1f2e34dceeb1ed6
   16. Fix a problem with the use of window functions used within
       correlated subqueries. Ticket d0866b26f83e9c55e3
   17. Fix the ALTER TABLE RENAME COLUMN command so that it works for
       tables that have redundant UNIQUE constraints. Ticket
       bc8d94f0fbd633fd9a
   18. Fix a bug that caused zeroblob values to be truncated when inserted
       into a table that uses an expression index. Ticket
       bb4bdb9f7f654b0bb9
       Hashes:
   19. SQLITE_SOURCE_ID: "2019-02-07 17:02:52
       97744701c3bd414e6c9d7182639d8c2ce7cf124c4fce625071ae65658ac61713 "
   20. SHA3-256 for sqlite3.c:
       ca011a10ee8515b33e5643444b98ee3d74dc45d3ac766c3700320def52bc6aba

  2018-12-01 (3.26.0)

    1. Optimization: When doing an UPDATE on a table with indexes on
       expressions, do not update the expression indexes if they do not
       refer to any of the columns of the table being updated.
    2. Allow the xBestIndex() method of virtual table implementations to
       return SQLITE_CONSTRAINT to indicate that the proposed query plan
       is unusable and should not be given further consideration.
    3. Added the SQLITE_DBCONFIG_DEFENSIVE option which disables the
       ability to create corrupt database files using ordinary SQL.
    4. Added support for read-only shadow tables when the
       SQLITE_DBCONFIG_DEFENSIVE option is enabled.
    5. Added the PRAGMA legacy_alter_table command, which if enabled
       causes the ALTER TABLE command to behave like older version of
       SQLite (prior to version 3.25.0) for compatibility.
    6. Added PRAGMA table_xinfo that works just like PRAGMA table_info
       except that it also shows hidden columns in virtual tables.
    7. Added the explain virtual table as a run-time loadable extension.
    8. Add a limit counter to the query planner to prevent excessive
       sqlite3_prepare() times for certain pathological SQL inputs.
    9. Added support for the sqlite3_normalized_sql() interface, when
       compiling with SQLITE_ENABLE_NORMALIZE.
   10. Enhanced triggers so that they can use table-valued functions that
       exist in schemas other than the schema where the trigger is
       defined.
   11. Enhancements to the CLI:
         a. Improvements to the ".help" command.
         b. The SQLITE_HISTORY environment variable, if it exists,
            specifies the name of the command-line editing history file
         c. The --deserialize option associated with opening a new
            database cause the database file to be read into memory and
            accessed using the sqlite3_deserialize() API. This simplifies
            running tests on a database without modifying the file on
            disk.
   12. Enhancements to the geopoly extension:
         a. Always stores polygons using the binary format, which is
            faster and uses less space.
         b. Added the geopoly_regular() function.
         c. Added the geopoly_ccw() function.
   13. Enhancements to the session extension:
         a. Added the SQLITE_CHANGESETAPPLY_INVERT flag
         b. Added the sqlite3changeset_start_v2() interface and the
            SQLITE_CHANGESETSTART_INVERT flag.
         c. Added the changesetfuzz.c test-case generator utility.
       Hashes:
   14. SQLITE_SOURCE_ID: "2018-12-01 12:34:55
       bf8c1b2b7a5960c282e543b9c293686dccff272512d08865f4600fb58238b4f9"
   15. SHA3-256 for sqlite3.c:
       72c08830da9b5d1cb397c612c0e870d7f5eb41a323b41aa3d8aa5ae9ccedb2c4

  2018-11-05 (3.25.3)

    1. Disallow the use of window functions in the recursive part of a
       CTE. Ticket e8275b415a2f03bee
    2. Fix the behavior of typeof() and length() on virtual tables. Ticket
       69d642332d25aa3b7315a6d385
    3. Strengthen defenses against deliberately corrupted database files.
    4. Fix a problem in the query planner that results when a row-value
       expression is used with a PRIMARY KEY with redundant columns.
       Ticket 1a84668dcfdebaf12415d
    5. Fix the query planner so that it works correctly for IS NOT NULL
       operators in the ON clause of a LEFT JOIN with the
       SQLITE_ENABLE_STAT4 compile-time option. 65eb38f6e46de8c75e188a17ec
       Hashes:
    6. SQLITE_SOURCE_ID: "2018-11-05 20:37:38
       89e099fbe5e13c33e683bef07361231ca525b88f7907be7092058007b75036f2"
    7. SHA3-256 for sqlite3.c:
       45586e4df74de3a43f3a1f8c7a78c3c3f02edce01af7d10cafe68bb94476a5c5

  2018-09-25 (3.25.2)

    1. Add the PRAGMA legacy_alter_table=ON command that causes the "ALTER
       TABLE RENAME" command to behave as it did in SQLite versions 3.24.0
       and earlier: references to the renamed table inside the bodies of
       triggers and views are not updated. This new pragma provides a
       compatibility work around for older programs that expected the
       older, wonky behavior of ALTER TABLE RENAME.
    2. Fix a problem with the new window functions implementation that
       caused a malfunction when complicated expressions involving window
       functions were used inside of a view.
    3. Fixes for various other compiler warnings and minor problems
       associated with obscure configurations.
       Hashes:
    4. SQLITE_SOURCE_ID: "2018-09-25 19:08:10
       fb90e7189ae6d62e77ba3a308ca5d683f90bbe633cf681865365b8e92792d1c7"
    5. SHA3-256 for sqlite3.c:
       34c23ff91631ae10354f8c9d62fd7d65732b3d7f3acfd0bbae31ff4a62fe28af

  2018-09-18 (3.25.1)

    1. Extra sanity checking added to ALTER TABLE in the 3.25.0 release
       sometimes raises a false-positive when the table being modified has
       a trigger that updates a virtual table. The false-positive caused
       the ALTER TABLE to rollback, thus leaving the schema unchanged.
       Ticket b41031ea2b537237.
    2. The fix in the 3.25.0 release for the endless-loop in the byte-code
       associated with the ORDER BY LIMIT optimization did not work for
       some queries involving window functions. An additional correction
       is required. Ticket 510cde277783b5fb
       Hashes:
    3. SQLITE_SOURCE_ID: "2018-09-18 20:20:44
       2ac9003de44da7dafa3fbb1915ac5725a9275c86bf2f3b7aa19321bf1460b386"
    4. SHA3-256 for sqlite3.c:
       1b2302e7a54cc99c84ff699a299f61f069a28e1ed090b89e4430ca80ae2aab06

  2018-09-15 (3.25.0)

    1. Add support for window functions
    2. Enhancements the ALTER TABLE command:
         a. Add support for renaming columns within a table using ALTER
            TABLE table RENAME COLUMN oldname TO newname.
         b. Fix table rename feature so that it also updates references to
            the renamed table in triggers and views.
    3. Query optimizer improvements:
         a. Avoid unnecessary loads of columns in an aggregate query that
            are not within an aggregate function and that are not part of
            the GROUP BY clause.
         b. The IN-early-out optimization: When doing a look-up on a
            multi-column index and an IN operator is used on a column
            other than the left-most column, then if no rows match against
            the first IN value, check to make sure there exist rows that
            match the columns to the right before continuing with the next
            IN value.
         c. Use the transitive property to try to propagate constant
            values within the WHERE clause. For example, convert "a=99 AND
            b=a" into "a=99 AND b=99".
    4. Use a separate mutex on every inode in the unix VFS, rather than a
       single mutex shared among them all, for slightly better concurrency
       in multi-threaded environments.
    5. Enhance the PRAGMA integrity_check command for improved detection
       of problems on the page freelist.
    6. Output infinity as 1e999 in the ".dump" command of the command-line
       shell.
    7. Added the SQLITE_FCNTL_DATA_VERSION file-control.
    8. Added the Geopoly module
       Bug fixes:
    9. The ORDER BY LIMIT optimization might have caused an infinite loop
       in the byte code of the prepared statement under very obscure
       circumstances, due to a confluence of minor defects in the query
       optimizer. Fix for ticket 9936b2fa443fec03ff25
   10. On an UPSERT when the order of constraint checks is rearranged,
       ensure that the affinity transformations on the inserted content
       occur before any of the constraint checks. Fix for ticket
       79cad5e4b2e219dd197242e9e.
   11. Avoid using a prepared statement for ".stats on" command of the CLI
       after it has been closed by the ".eqp full" logicc. Fix for ticket
       7be932dfa60a8a6b3b26bcf76.
   12. The LIKE optimization was generating incorrect byte-code and hence
       getting the wrong answer if the left-hand operand has numeric
       affinity and the right-hand-side pattern is '/%' or if the pattern
       begins with the ESCAPE character. Fix for ticket
       c94369cae9b561b1f996d0054b
       Hashes:
   13. SQLITE_SOURCE_ID: "2018-09-15 04:01:47
       b63af6c3bd33152742648d5d2e8dc5d5fcbcdd27df409272b6aea00a6f761760"
   14. SHA3-256 for sqlite3.c:
       989e3ff37f2b5eea8e42205f808ccf0ba86c6ea6aa928ad2c011f33a108ac45d

  2018-06-04 (3.24.0)

    1. Add support for PostgreSQL-style UPSERT.
    2. Add support for auxiliary columns in r-tree tables.
    3. Add C-language APIs for discovering SQL keywords used by SQLite:
       sqlite3_keyword_count(), sqlite3_keyword_name(), and
       sqlite3_keyword_check().
    4. Add C-language APIs for dynamic strings based on the sqlite3_str
       object.
    5. Enhance ALTER TABLE so that it recognizes "true" and "false" as
       valid arguments to DEFAULT.
    6. Add the sorter-reference optimization as a compile-time option.
       Only available if compiled with SQLITE_ENABLE_SORTER_REFERENCES.
    7. Improve the format of the EXPLAIN QUERY PLAN raw output, so that it
       gives better information about the query plan and about the
       relationships between the various components of the plan.
    8. Added the SQLITE_DBCONFIG_RESET_DATABASE option to the
       sqlite3_db_config() API.
       CLI Enhancements:
    9. Automatically intercepts the raw EXPLAIN QUERY PLAN output and
       reformats it into an ASCII-art graph.
   10. Lines that begin with "#" and that are not in the middle of an SQL
       statement are interpreted as comments.
   11. Added the --append option to the ".backup" command.
   12. Added the ".dbconfig" command.
       Performance:
   13. UPDATE avoids unnecessary low-level disk writes when the contents
       of the database file do not actually change. For example, "UPDATE
       t1 SET x=25 WHERE y=?" generates no extra disk I/O if the value in
       column x is already 25. Similarly, when doing UPDATE on records
       that span multiple pages, only the subset of pages that actually
       change are written to disk. This is a low-level performance
       optimization only and does not affect the behavior of TRIGGERs or
       other higher level SQL structures.
   14. Queries that use ORDER BY and LIMIT now try to avoid computing rows
       that cannot possibly come in under the LIMIT. This can greatly
       improve performance of ORDER BY LIMIT queries, especially when the
       LIMIT is small relative to the number of unrestricted output rows.
   15. The OR optimization is allowed to proceed even if the OR expression
       has also been converted into an IN expression. Uses of the OR
       optimization are now also more clearly shown in the EXPLAIN QUERY
       PLAN output.
   16. The query planner is more aggressive about using automatic indexes
       for views and subqueries for which it is not possible to create a
       persistent index.
   17. Make use of the one-pass UPDATE and DELETE query plans in the
       R-Tree extension where appropriate.
   18. Performance improvements in the LEMON-generated parser.
       Bug fixes:
   19. For the right-hand table of a LEFT JOIN, compute the values of
       expressions directly rather than loading precomputed values out of
       an expression index as the expression index might not contain the
       correct value. Ticket 7fa8049685b50b5aeb0c2
   20. Do not attempt to use terms from the WHERE clause to enable indexed
       lookup of the right-hand table of a LEFT JOIN. Ticket
       4ba5abf65c5b0f9a96a7a
   21. Fix a memory leak that can occur following a failure to open error
       in the CSV virtual table
   22. Fix a long-standing problem wherein a corrupt schema on the
       sqlite_sequence table used by AUTOINCREMENT can lead to a crash.
       Ticket d8dc2b3a58cd5dc2918a1
   23. Fix the json_each() function so that it returns valid results on
       its "fullkey" column when the input is a simple value rather than
       an array or object.
       Hashes:
   24. SQLITE_SOURCE_ID: "2018-06-04 19:24:41
       c7ee0833225bfd8c5ec2f9bf62b97c4e04d03bd9566366d5221ac8fb199a87ca"
   25. SHA3-256 for sqlite3.c:
       0d384704e1c66026228336d1e91771d295bf688c9c44c7a44f25a4c16c26ab3c

  2018-04-10 (3.23.1)

    1. Fix two problems in the new LEFT JOIN strength reduction
       optimization. Tickets 1e39b966ae9ee739 and fac496b61722daf2.
    2. Fix misbehavior of the FTS5 xBestIndex method. Ticket
       2b8aed9f7c9e61e8.
    3. Fix a harmless reference to an uninitialized virtual machine
       register. Ticket 093420fc0eb7cba7.
    4. Fix the CLI so that it builds with -DSQLITE_UNTESTABLE
    5. Fix the eval.c extension so that it works with PRAGMA
       empty_result_callbacks=ON.
    6. Fix the generate_series virtual table so that it correctly returns
       no rows if any of its constraints are NULL.
    7. Performance enhancements in the parser.
       Hashes:
    8. SQLITE_SOURCE_ID: "2018-04-10 17:39:29
       4bb2294022060e61de7da5c227a69ccd846ba330e31626ebcd59a94efd148b3b"
    9. SHA3-256 for sqlite3.c:
       65750d1e506f416a0b0b9dd22d171379679c733e3460549754dc68c92705b5dc

  2018-04-02 (3.23.0)

    1. Add the sqlite3_serialize() and sqlite3_deserialize() interfaces
       when the SQLITE_ENABLE_DESERIALIZE compile-time option is used.
    2. Recognize TRUE and FALSE as constants. (For compatibility, if there
       exist columns named "true" or "false", then the identifiers refer
       to the columns rather than Boolean constants.)
    3. Support operators IS TRUE, IS FALSE, IS NOT TRUE, and IS NOT FALSE.
    4. Added the SQLITE_DBSTATUS_CACHE_SPILL option to sqlite3_db_status()
       for reporting the number of cache spills that have occurred.
    5. The "alternate-form-2" flag ("!") on the built-in printf
       implementation now causes string substitutions to measure the width
       and precision in characters instead of bytes.
    6. If the xColumn method in a virtual table implementation returns an
       error message using sqlite3_result_error() then give that error
       message preference over internally-generated messages.
    7. Added the -A command-line option to the CLI to make it easier to
       manage SQLite Archive files.
    8. Add support for INSERT OR REPLACE, INSERT OR IGNORE, and UPDATE OR
       REPLACE in the Zipfile virtual table.
    9. Enhance the sqlite3changeset_apply() interface so that it is
       hardened against attacks from deliberately corrupted changeset
       objects.
   10. Added the sqlite3_normalize() extension function.
   11. Query optimizer enhancements:
         a. Improve the omit-left-join optimization so that it works in
            cases where the right-hand table is UNIQUE but not necessarily
            NOT NULL.
         b. Improve the push-down optimization so that it works for many
            LEFT JOINs.
         c. Add the LEFT JOIN strength reduction optimization that
            converts a LEFT JOIN into an ordinary JOIN if there exist
            terms in the WHERE clause that would prevent the extra
            all-NULL row of the LEFT JOIN from appearing in the output
            set.
         d. Avoid unnecessary writes to the sqlite_sequence table when an
            AUTOINCREMENT table is updated with an rowid that is less than
            the maximum.
   12. Bug fixes:
         a. Fix the parser to accept valid row value syntax. Ticket
            7310e2fb3d046a5
         b. Fix the query planner so that it takes into account
            dependencies in the arguments to table-valued functions in
            subexpressions in the WHERE clause. Ticket 80177f0c226ff54
         c. Fix incorrect result with complex OR-connected WHERE and
            STAT4. Ticket ec32177c99ccac2
         d. Fix potential corruption in indexes on expressions due to
            automatic datatype conversions. Ticket 343634942dd54ab
         e. Assertion fault in FTS4. Ticket d6ec09eccf68cfc
         f. Incorrect result on the less-than operator in row values.
            Ticket f484b65f3d62305
         g. Always interpret non-zero floating-point values as TRUE, even
            if the integer part is zero. Ticket 36fae083b450e3a
         h. Fix an issue in the fsdir(PATH) table-valued function to the
            fileio.c extension, that caused a segfault if the fsdir()
            table was used as the inner table of a join. Problem reported
            on the mailing list and fixed by check-in 7ce4e71c1b7251be
         i. Issue an error rather instead of an assertion-fault or
            null-pointer dereference when the sqlite_master table is
            corrupted so that the sqlite_sequence table root page is
            really a btree-index page. Check-in 525deb7a67fbd647
         j. Fix the ANALYZE command so that it computes statistics on
            tables whose names begin with "sqlite". Check-in
            0249d9aecf69948d
   13. Additional fixes for issues detected by OSSFuzz:
         a. Fix a possible infinite loop on VACUUM for corrupt database
            files. Check-in 27754b74ddf64
         b. Disallow parameters in the WITH clause of triggers and views.
            Check-in b918d4b4e546d
         c. Fix a potential memory leak in row value processing. Check-in
            2df6bbf1b8ca8
         d. Improve the performance of the replace() SQL function for
            cases where there are many substitutions on megabyte-sized
            strings, in an attempt to avoid OSSFuzz timeouts during
            testing. Check-in fab2c2b07b5d3
         e. Provide an appropriate error message when the sqlite_master
            table contains a CREATE TABLE AS statement. Formerly this
            caused either an assertion fault or null pointer dereference.
            Problem found by OSSFuzz on the GDAL project. Check-in
            d75e67654aa96
         f. Incorrect assert() statement removed. Check-in
            823779d31eb09cda.
         g. Fix a problem with using the LIKE optimization on an INTEGER
            PRIMARY KEY. Check-in b850dd159918af56.
       Hashes:
   14. SQLITE_SOURCE_ID: "2018-04-02 11:04:16
       736b53f57f70b23172c30880186dce7ad9baa3b74e3838cae5847cffb98f5cd2"
   15. SHA3-256 for sqlite3.c:
       4bed3dc2dc905ff55e2c21fd2725551fc0ca50912a9c96c6af712a4289cb24fa

  2018-01-22 (3.22.0)

    1. The output of sqlite3_trace_v2() now shows each individual SQL
       statement run within a trigger.
    2. Add the ability to read from WAL mode databases even if the
       application lacks write permission on the database and its
       containing directory, as long as the -shm and -wal files exist in
       that directory.
    3. Added the rtreecheck() scalar SQL function to the R-Tree extension.
    4. Added the sqlite3_vtab_nochange() and sqlite3_value_nochange()
       interfaces to help virtual table implementations optimize UPDATE
       operations.
    5. Added the sqlite3_vtab_collation() interface.
    6. Added support for the "^" initial token syntax in FTS5.
    7. New extensions:
         a. The Zipfile virtual table can read and write a ZIP Archive.
         b. Added the fsdir(PATH) table-valued function to the fileio.c
            extension, for listing the files in a directory.
         c. The sqlite_btreeinfo eponymous virtual table for introspecting
            and estimating the sizes of the btrees in a database.
         d. The Append VFS is a VFS shim that allows an SQLite database to
            be appended to some other file. This allows (for example) a
            database to be appended to an executable that then opens and
            reads the database.
    8. Query planner enhancements:
         a. The optimization that uses an index to quickly compute an
            aggregate min() or max() is extended to work with indexes on
            expressions.
         b. The decision of whether to implement a FROM-clause subquery as
            a co-routine or using query flattening now considers whether
            the result set of the outer query is "complex" (if it contains
            functions or expression subqueries). A complex result set
            biases the decision toward the use of co-routines.
         c. The planner avoids query plans that use indexes with unknown
            collating functions.
         d. The planner omits unused LEFT JOINs even if they are not the
            right-most joins of a query.
    9. Other performance optimizations:
         a. A smaller and faster implementation of text to floating-point
            conversion subroutine: sqlite3AtoF().
         b. The Lemon parser generator creates a faster parser.
         c. Use the strcspn() C-library routine to speed up the LIKE and
            GLOB operators.
   10. Improvements to the command-line shell:
         a. The ".schema" command shows the structure of virtual tables.
         b. Added support for reading and writing SQLite Archive files
            using the .archive command.
         c. Added the experimental .expert command
         d. Added the ".eqp trigger" variant of the ".eqp" command
         e. Enhance the ".lint fkey-indexes" command so that it works with
            WITHOUT ROWID tables.
         f. If the filename argument to the shell is a ZIP archive rather
            than an SQLite database, then the shell automatically opens
            that ZIP archive using the Zipfile virtual table.
         g. Added the edit() SQL function.
         h. Added the .excel command to simplify exporting database
            content to a spreadsheet.
         i. Databases are opened using Append VFS when the --append flag
            is used on the command line or with the .open command.
   11. Enhance the SQLITE_ENABLE_UPDATE_DELETE_LIMIT compile-time option
       so that it works for WITHOUT ROWID tables.
   12. Provide the sqlite_offset(X) SQL function that returns the byte
       offset into the database file to the beginning of the record
       holding value X, when compiling with
       -DSQLITE_ENABLE_OFFSET_SQL_FUNC.
   13. Bug fixes:
         a. Infinite loop on an UPDATE that uses an OR operator in the
            WHERE clause. Problem introduced with 3.17.0 and reported on
            the mailing list about one year later. Ticket
            47b2581aa9bfecec.
         b. Incorrect query results when the skip-ahead-distinct
            optimization is used. Ticket ef9318757b152e3a.
         c. Incorrect query results on a join with a ORDER BY DESC. Ticket
            123c9ba32130a6c9.
         d. Inconsistent result set column names between CREATE TABLE AS
            and a simple SELECT. Ticket 3b4450072511e621
         e. Assertion fault when doing REPLACE on an index on an
            expression. Ticket dc3f932f5a147771
         f. Assertion fault when doing an IN operator on a constant index.
            Ticket aa98619ad08ddcab
       Hashes:
   14. SQLITE_SOURCE_ID: "2018-01-22 18:45:57
       0c55d179733b46d8d0ba4d88e01a25e10677046ee3da1d5b1581e86726f2171d"
   15. SHA3-256 for sqlite3.c:
       206df47ebc49cd1710ac0dd716ce5de5854826536993f4feab7a49d136b85069

  2017-10-24 (3.21.0)

    1. Take advantage of the atomic-write capabilities in the F2FS
       filesystem when available, for greatly reduced transaction
       overhead. This currently requires the
       SQLITE_ENABLE_BATCH_ATOMIC_WRITE compile-time option.
    2. Allow ATTACH and DETACH commands to work inside of a transaction.
    3. Allow WITHOUT ROWID virtual tables to be writable if the PRIMARY
       KEY contains exactly one column.
    4. The "fsync()" that occurs after the header is written in a WAL
       reset now uses the sync settings for checkpoints. This means it
       will use a "fullfsync" on macs if PRAGMA checkpoint_fullfsync set
       on.
    5. The sqlite3_sourceid() function tries to detect if the source code
       has been modified from what is checked into version control and if
       there are modifications, the last four characters of the version
       hash are shown as "alt1" or "alt2". The objective is to detect
       accidental and/or careless edits. A forger can subvert this
       feature.
    6. Improved de-quoting of column names for CREATE TABLE AS statements
       with an aggregate query on the right-hand side.
    7. Fewer "stat()" system calls issued by the unix VFS.
    8. Enhanced the LIKE optimization so that it works with an ESCAPE
       clause.
    9. Enhanced PRAGMA integrity_check and PRAGMA quick_check to detect
       obscure row corruption that they were formerly missing. Also update
       both pragmas so that they return error text rather than
       SQLITE_CORRUPT when encountering corruption in records.
   10. The query planner now prefers to implement FROM-clause subqueries
       using co-routines rather using the query flattener optimization.
       Support for the use of co-routines for subqueries may no longer be
       disabled.
   11. Pass information about !=, IS, IS NOT, NOT NULL, and IS NULL
       constraints into the xBestIndex method of virtual tables.
   12. Enhanced the CSV virtual table so that it accepts the last row of
       input if the final new-line character is missing.
   13. Remove the rarely-used "scratch" memory allocator. Replace it with
       the SQLITE_CONFIG_SMALL_MALLOC configuration setting that gives
       SQLite a hint that large memory allocations should be avoided when
       possible.
   14. Added the swarm virtual table to the existing union virtual table
       extension.
   15. Added the sqlite_dbpage virtual table for providing direct access
       to pages of the database file. The source code is built into the
       amalgamation and is activated using the -DSQLITE_ENABLE_DBPAGE_VTAB
       compile-time option.
   16. Add a new type of fts5vocab virtual table - "instance" - that
       provides direct access to an FTS5 full-text index at the lowest
       possible level.
   17. Remove a call to rand_s() in the Windows VFS since it was causing
       problems in Firefox on some older laptops.
   18. The src/shell.c source code to the command-line shell is no longer
       under version control. That file is now generated as part of the
       build process.
   19. Miscellaneous microoptimizations reduce CPU usage by about 2.1%.
   20. Bug fixes:
         a. Fix a faulty assert() statement discovered by OSSFuzz. Ticket
            cb91bf4290c211d
         b. Fix an obscure memory leak in sqlite3_result_pointer(). Ticket
            7486aa54b968e9b
         c. Avoid a possible use-after-free error by deferring schema
            resets until after the query planner has finished running.
            Ticket be436a7f4587ce5
         d. Only use indexes-on-expressions to optimize ORDER BY or GROUP
            BY if the COLLATE is correct. Ticket e20dd54ab0e4383
         e. Fix an assertion fault that was coming up when the expression
            in an index-on-expressions is really a constant. Ticket
            aa98619ad08ddca
         f. Fix an assertion fault that could occur following PRAGMA
            reverse_unordered_selects. Ticket cb91bf4290c211d
         g. Fix a segfault that can occur for queries that use
            table-valued functions in an IN or EXISTS subquery. Ticket
            b899b6042f97f5
         h. Fix a potential integer overflow problem when compiling a
            particular horrendous common table expression. This was
            another problem discovered by OSSFuzz. Check-in 6ee8cb6ae5.
         i. Fix a potential out-of-bound read when querying a corrupt
            database file, a problem detected by Natalie Silvanovich of
            Google Project Zero. Check-in 04925dee41a21f.
       Hashes:
   21. SQLITE_SOURCE_ID: "2017-10-24 18:55:49
       1a584e499906b5c87ec7d43d4abce641fdf017c42125b083109bc77c4de48827"
   22. SHA3-256 for sqlite3.c:
       84c181c0283d0320f488357fc8aab51898370c157601459ebee49d779036fe03

  2017-08-24 (3.20.1)

    1. Fix a potential memory leak in the new sqlite3_result_pointer()
       interface. Ticket 7486aa54b968e9b5.
       Hashes:
    2. SQLITE_SOURCE_ID: "2017-08-24 16:21:36
       8d3a7ea6c5690d6b7c3767558f4f01b511c55463e3f9e64506801fe9b74dce34"
    3. SHA3-256 for sqlite3.c:
       93b1a6d69b48dc39697d1d3a1e4c30b55da0bdd2cad0c054462f91081832954a

  2017-08-01 (3.20.0)

    1. Update the text of error messages returned by sqlite3_errmsg() for
       some error codes.
    2. Add new pointer passing interfaces.
    3. Backwards-incompatible changes to some extensions in order to take
       advantage of the improved security offered by the new pointer
       passing interfaces:
         a. Extending FTS5 → requires sqlite3_bind_pointer() to find the
            fts5_api pointer.
         b. carray(PTR,N) → requires sqlite3_bind_pointer() to set the PTR
            parameter.
         c. remember(V,PTR) → requires sqlite3_bind_pointer() to set the
            PTR parameter.
    4. Added the SQLITE_STMT virtual table extension.
    5. Added the COMPLETION extension - designed to suggest
       tab-completions for interactive user interfaces. This is a work in
       progress. Expect further enhancements in future releases.
    6. Added the UNION virtual table extension.
    7. The built-in date and time functions have been enhanced so that
       they can be used in CHECK constraints, in indexes on expressions,
       and in the WHERE clauses of partial indexes, provided that they do
       not use the 'now', 'localtime', or 'utc' keywords. More
       information.
    8. Added the sqlite3_prepare_v3() and sqlite3_prepare16_v3()
       interfaces with the extra "prepFlags" parameters.
    9. Provide the SQLITE_PREPARE_PERSISTENT flag for sqlite3_prepare_v3()
       and use it to limit lookaside memory misuse by FTS3, FTS5, and the
       R-Tree extension.
   10. Added the PRAGMA secure_delete=FAST command. When secure_delete is
       set to FAST, old content is overwritten with zeros as long as that
       does not increase the amount of I/O. Deleted content might still
       persist on the free-page list but will be purged from all b-tree
       pages.
   11. Enhancements to the command-line shell:
         a. Add support for tab-completion using the COMPLETION extension,
            for both readline and linenoise.
         b. Add the ".cd" command.
         c. Enhance the ".schema" command to show the schema of all
            attached databases.
         d. Enhance ".tables" so that it shows the schema names for all
            attached if the name is anything other than "main".
         e. The ".import" command ignores an initial UTF-8 BOM.
         f. Added the "--newlines" option to the ".dump" command to cause
            U+000a and U+000d characters to be output literally rather
            than escaped using the replace() function.
   12. Query planner enhancements:
         a. When generating individual loops for each ORed term of an OR
            scan, move any constant WHERE expressions outside of the loop,
            as is done for top-level loops.
         b. The query planner examines the values of bound parameters to
            help determine if a partial index is usable.
         c. When deciding between two plans with the same estimated cost,
            bias the selection toward the one that does not use the
            sorter.
         d. Evaluate WHERE clause constraints involving correlated
            subqueries last, in the hope that they never have be evaluated
            at all.
         e. Do not use the flattening optimization for a sub-query on the
            RHS of a LEFT JOIN if that subquery reads data from a virtual
            table as doing so prevents the query planner from creating
            automatic indexes on the results of the sub-query, which can
            slow down the query.
   13. Add SQLITE_STMTSTATUS_REPREPARE, SQLITE_STMTSTATUS_RUN, and
       SQLITE_STMTSTATUS_MEMUSED options for the sqlite3_stmt_status()
       interface.
   14. Provide PRAGMA functions for PRAGMA integrity_check, PRAGMA
       quick_check, and PRAGMA foreign_key_check.
   15. Add the -withoutnulls option to the TCL interface eval method.
   16. Enhance the sqlite3_analyzer.exe utility program so that it shows
       the number of bytes of metadata on btree pages.
   17. The SQLITE_DBCONFIG_ENABLE_QPSG run-time option and the
       SQLITE_ENABLE_QPSG compile-time option enable the query planner
       stability guarantee. See also ticket 892fc34f173e99d8
   18. Miscellaneous optimizations result in a 2% reduction in CPU cycles
       used.
       Bug Fixes:
   19. Fix the behavior of sqlite3_column_name() for queries that use the
       flattening optimization so that the result is consistent with other
       queries that do not use that optimization, and with PostgreSQL,
       MySQL, and SQLServer. Ticket de3403bf5ae.
   20. Fix the query planner so that it knows not to use automatic indexes
       on the right table of LEFT JOIN if the WHERE clause uses the IS
       operator. Fix for ce68383bf6aba.
   21. Ensure that the query planner knows that any column of a flattened
       LEFT JOIN can be NULL even if that column is labeled with "NOT
       NULL". Fix for ticket 892fc34f173e99d8.
   22. Fix rare false-positives in PRAGMA integrity_check when run on a
       database connection with attached databases. Ticket
       a4e06e75a9ab61a12
   23. Fix a bug (discovered by OSSFuzz) that causes an assertion fault if
       certain dodgy CREATE TABLE declarations are used. Ticket
       bc115541132dad136
       Hashes:
   24. SQLITE_SOURCE_ID: "2017-08-01 13:24:15
       9501e22dfeebdcefa783575e47c60b514d7c2e0cad73b2a496c0bc4b680900a8"
   25. SHA3-256 for sqlite3.c:
       79b7f3b977360456350219cba0ba0e5eb55910565eab68ea83edda2f968ebe95

  2017-06-17 (3.18.2)

    1. Fix a bug that might cause duplicate output rows when an IN
       operator is used in the WHERE clause. Ticket 61fe9745.
       Hashes:
    2. SQLITE_SOURCE_ID: "2017-06-17 09:59:36
       036ebf729e4b21035d7f4f8e35a6f705e6bf99887889e2dc14ebf2242e7930dd"
    3. SHA3-256 for sqlite3.c:
       b0bd014f2776b9f9508a3fc6432f70e2436bf54475369f88f0aeef75b0eec93e

  2017-06-16 (3.18.1)

    1. Fix a bug associated with auto_vacuum that can lead to database
       corruption. The bug was introduced in version 3.16.0 (2017-01-02).
       Ticket fda22108.
       Hashes:
    2. SQLITE_SOURCE_ID: "2017-06-16 13:41:15
       77bb46233db03a3338bacf7e56f439be3dfd1926ea0c44d252eeafa7a7b31c06"
    3. SHA3-256 for sqlite3.c:
       334eaf776db9d09a4e69d6012c266bc837107edc2c981739ef82081cb11c5723

  2017-06-08 (3.19.3)

    1. Fix a bug associated with auto_vacuum that can lead to database
       corruption. The bug was introduced in version 3.16.0 (2017-01-02).
       Ticket fda22108.
       Hashes:
    2. SQLITE_SOURCE_ID: "2017-06-08 14:26:16
       0ee482a1e0eae22e08edc8978c9733a96603d4509645f348ebf55b579e89636b"
    3. SHA3-256 for sqlite3.c:
       368f1d31272b1739f804bcfa5485e5de62678015c4adbe575003ded85c164bb8

  2017-05-25 (3.19.2)

    1. Fix more bugs in the LEFT JOIN flattening optimization. Ticket
       7fde638e94287d2c.
       Hashes:
    2. SQLITE_SOURCE_ID: "2017-05-25 16:50:27
       edb4e819b0c058c7d74d27ebd14cc5ceb2bad6a6144a486a970182b7afe3f8b9"
    3. SHA3-256 for sqlite3.c:
       1be0c457869c1f7eba58c3b5097b9ec307a15be338308bee8e5be8570bcf5d1e

  2017-05-24 (3.19.1)

    1. Fix a bug in the LEFT JOIN flattening optimization. Ticket
       cad1ab4cb7b0fc.
    2. Remove a surplus semicolon that was causing problems for older
       versions of MSVC.
       Hashes:
    3. SQLITE_SOURCE_ID: "2017-05-24 13:08:33
       f6d7b988f40217821a382bc298180e9e6794f3ed79a83c6ef5cae048989b3f86"
    4. SHA3-256 for sqlite3.c:
       996b2aff37b6e0c6663d0312cd921bbdf6826c989cbbb07dadde5e9672889bca

  2017-05-22 (3.19.0)

    1. The SQLITE_READ authorizer callback is invoked once with a column
       name that is an empty string for every table referenced in a query
       from which no columns are extracted.
    2. When using an index on an expression, try to use expression values
       already available in the index, rather than loading the original
       columns and recomputing the expression.
    3. Enhance the flattening optimization so that it is able to flatten
       views on the right-hand side of a LEFT JOIN.
    4. Use replace() instead of char() for escaping newline and
       carriage-return characters embedded in strings in the .dump output
       from the command-line shell.
    5. Avoid unnecessary foreign key processing in UPDATE statements that
       do not touch the columns that are constrained by the foreign keys.
    6. On a DISTINCT query that uses an index, try to skip ahead to the
       next distinct entry using the index rather than stepping through
       rows, when an appropriate index is available.
    7. Avoid unnecessary invalidation of sqlite3_blob handles when making
       changes to unrelated tables.
    8. Transfer any terms of the HAVING clause that use only columns
       mentioned in the GROUP BY clause over to the WHERE clause for
       faster processing.
    9. Reuse the same materialization of a VIEW if that VIEW appears more
       than once in the same query.
   10. Enhance PRAGMA integrity_check so that it identifies tables that
       have two or more rows with the same rowid.
   11. Enhance the FTS5 query syntax so that column filters may be applied
       to arbitrary expressions.
   12. Enhance the json_extract() function to cache and reuse parses of
       JSON input text.
   13. Added the anycollseq.c loadable extension that allows a generic
       SQLite database connection to read a schema that contains unknown
       and/or application-specific collating sequences.
       Bug Fixes:
   14. Fix a problem in REPLACE that can result in a corrupt database
       containing two or more rows with the same rowid. Fix for ticket
       f68dc596c4e6018d.
   15. Fix a problem in PRAGMA integrity_check that was causing a
       subsequent VACUUM to behave suboptimally.
   16. Fix the PRAGMA foreign_key_check command so that it works correctly
       with foreign keys on WITHOUT ROWID tables.
   17. Fix a bug in the b-tree logic that can result in incorrect
       duplicate answers for IN operator queries. Ticket 61fe9745
   18. Disallow leading zeros in numeric constants in JSON. Fix for ticket
       b93be8729a895a528e2.
   19. Disallow control characters inside of strings in JSON. Fix for
       ticket 6c9b5514077fed34551.
   20. Limit the depth of recursion for JSON objects and arrays in order
       to avoid excess stack usage in the recursive descent parser. Fix
       for ticket 981329adeef51011052.
       Hashes:
   21. SQLITE_SOURCE_ID: "2017-05-22 13:58:13
       28a94eb282822cad1d1420f2dad6bf65e4b8b9062eda4a0b9ee8270b2c608e40"
   22. SHA3-256 for sqlite3.c:
       c30326aa1a9cc342061b755725eac9270109acf878bc59200dd4b1cea6bc2908

  2017-03-30 (3.18.0)

    1. Added the PRAGMA optimize command
    2. The SQLite version identifier returned by the sqlite_source_id()
       SQL function and the sqlite3_sourceid() C API and found in the
       SQLITE_SOURCE_ID macro is now a 64-digit SHA3-256 hash instead of a
       40-digit SHA1 hash.
    3. Added the json_patch() SQL function to the JSON1 extension.
    4. Enhance the LIKE optimization so that it works for arbitrary
       expressions on the left-hand side as long as the LIKE pattern on
       the right-hand side does not begin with a digit or minus sign.
    5. Added the sqlite3_set_last_insert_rowid() interface and use the new
       interface in the FTS3, FTS4, and FTS5 extensions to ensure that the
       sqlite3_last_insert_rowid() interface always returns reasonable
       values.
    6. Enhance PRAGMA integrity_check and PRAGMA quick_check so that they
       verify CHECK constraints.
    7. Enhance the query plans for joins to detect empty tables early and
       halt without doing unnecessary work.
    8. Enhance the sqlite3_mprintf() family of interfaces and the printf
       SQL function to put comma separators at the thousands marks for
       integers, if the "," format modifier is used in between the "%" and
       the "d" (example: "%,d").
    9. Added the -DSQLITE_MAX_MEMORY=N compile-time option.
   10. Added the .sha3sum dot-command and the .selftest dot-command to the
       command-line shell
   11. Begin enforcing SQLITE_LIMIT_VDBE_OP. This can be used, for
       example, to prevent excessively large prepared statements in
       systems that accept SQL queries from untrusted users.
   12. Various performance improvements.
       Bug Fixes:
   13. Ensure that indexed expressions with collating sequences are
       handled correctly. Fix for ticket eb703ba7b50c1a5.
   14. Fix a bug in the 'start of ...' modifiers for the date and time
       functions. Ticket 6097cb92745327a1
   15. Fix a potential segfault in complex recursive triggers, resulting
       from a bug in the OP_Once opcode introduced as part of a
       performance optimization in version 3.15.0. Ticket 06796225f59c057c
   16. In the RBU extension, add extra sync operations to avoid the
       possibility of corruption following a power failure.
   17. The sqlite3_trace_v2() output for nested SQL statements should
       always begin with a "--" comment marker.
       Hashes:
   18. SQLITE_SOURCE_ID: "2017-03-28 18:48:43
       424a0d380332858ee55bdebc4af3789f74e70a2b3ba1cf29d84b9b4bcf3e2e37"
   19. SHA3-256 for sqlite3.c:
       cbf322df1f76be57fb3be84f3da1fc71d1d3dfdb7e7c2757fb0ff630b3bc2e5d

  2017-02-13 (3.17.0)

    1. Approximately 25% better performance from the R-Tree extension.
         a. Uses compiler built-ins (ex: __builtin_bswap32() or
            _byteswap_ulong()) for byteswapping when available.
         b. Uses the sqlite3_blob key/value access object instead of SQL
            for pulling content out of R-Tree nodes
         c. Other miscellaneous enhancements such as loop unrolling.
    2. Add the SQLITE_DEFAULT_LOOKASIDE compile-time option.
    3. Increase the default lookaside size from 512,125 to 1200,100 as
       this provides better performance while only adding 56KB of extra
       memory per connection. Memory-sensitive applications can restore
       the old default at compile-time, start-time, or run-time.
    4. Use compiler built-ins __builtin_sub_overflow(),
       __builtin_add_overflow(), and __builtin_mul_overflow() when
       available. (All compiler built-ins can be omitted with the
       SQLITE_DISABLE_INTRINSIC compile-time option.)
    5. Added the SQLITE_ENABLE_NULL_TRIM compile-time option, which can
       result in significantly smaller database files for some
       applications, at the risk of being incompatible with older versions
       of SQLite.
    6. Change SQLITE_DEFAULT_PCACHE_INITSZ from 100 to 20, for improved
       performance.
    7. Added the SQLITE_UINT64_TYPE compile-time option as an analog to
       SQLITE_INT64_TYPE.
    8. Perform some UPDATE operations in a single pass instead of in two
       passes.
    9. Enhance the session extension to support WITHOUT ROWID tables.
   10. Fixed performance problems and potential stack overflows when
       creating views from multi-row VALUES clauses with hundreds of
       thousands of rows.
   11. Added the sha1.c extension.
   12. In the command-line shell, enhance the ".mode" command so that it
       restores the default column and row separators for modes "line",
       "list", "column", and "tcl".
   13. Enhance the SQLITE_DIRECT_OVERFLOW_READ option so that it works in
       WAL mode as long as the pages being read are not in the WAL file.
   14. Enhance the Lemon parser generator so that it can store the parser
       object as a stack variable rather than allocating space from the
       heap and make use of that enhancement in the amalgamation.
   15. Other performance improvements. Uses about 6.5% fewer CPU cycles.
       Bug Fixes:
   16. Throw an error if the ON clause of a LEFT JOIN references tables to
       the right of the ON clause. This is the same behavior as
       PostgreSQL. Formerly, SQLite silently converted the LEFT JOIN into
       an INNER JOIN. Fix for ticket 25e335f802dd.
   17. Use the correct affinity for columns of automatic indexes. Ticket
       7ffd1ca1d2ad4ec.
   18. Ensure that the sqlite3_blob_reopen() interface can correctly
       handle short rows. Fix for ticket e6e962d6b0f06f46e.
       Hashes:
   19. SQLITE_SOURCE_ID: "2017-02-13 16:02:40
       ada05cfa86ad7f5645450ac7a2a21c9aa6e57d2c"
   20. SHA1 for sqlite3.c: cc7d708bb073c44102a59ed63ce6142da1f174d1

  2017-01-06 (3.16.2)

    1. Fix the REPLACE statement for WITHOUT ROWID tables that lack
       secondary indexes so that it works correctly with triggers and
       foreign keys. This was a new bug caused by performance
       optimizations added in version 3.16.0. Ticket 30027b613b4
    2. Fix the sqlite3_value_text() interface so that it correctly
       translates content generated by zeroblob() into a string of all
       0x00 characters. This is a long-standing issue discovered after the
       3.16.1 release by OSS-Fuzz
    3. Fix the bytecode generator to deal with a subquery in the FROM
       clause that is itself a UNION ALL where one side of the UNION ALL
       is a view that contains an ORDER BY. This is a long-standing issue
       that was discovered after the release of 3.16.1. See ticket
       190c2507.
    4. Adjust the sqlite3_column_count() API so it more often returns the
       same values for PRAGMA statements as it did in prior releases, to
       minimize disruption to applications that might be using that
       interface in unexpected ways.
       Hashes:
    5. SQLITE_SOURCE_ID: "2017-01-06 16:32:41
       a65a62893ca8319e89e48b8a38cf8a59c69a8209"
    6. SHA1 for sqlite3.c: 2bebdc3f24911c0d12b6d6c0123c3f84d6946b08

  2017-01-03 (3.16.1)

    1. Fix a bug concerning the use of row values within triggers (see
       ticket 8c9458e7) that was in version 3.15.0 but was not reported
       until moments after the 3.16.0 release was published.
       Hashes:
    2. SQLITE_SOURCE_ID: "2017-01-03 18:27:03
       979f04392853b8053817a3eea2fc679947b437fd"
    3. SHA1 for sqlite3.c: 354f6223490b30fd5320b4066b1535e4ce33988d

  2017-01-02 (3.16.0)

    1. Uses 9% fewer CPU cycles. (See the CPU performance measurement
       report for details on how this performance increase was computed.)
    2. Added experimental support for PRAGMA functions.
    3. Added the SQLITE_DBCONFIG_NO_CKPT_ON_CLOSE option to
       sqlite3_db_config().
    4. Enhance the date and time functions so that the 'unixepoch'
       modifier works for the full span of supported dates.
    5. Changed the default configuration of the lookaside memory allocator
       from 500 slots of 128 bytes each into 125 slots of 512 bytes each.
    6. Enhanced "WHERE x NOT NULL" partial indexes so that they are usable
       if the "x" column appears in a LIKE or GLOB operator.
    7. Enhanced sqlite3_interrupt() so that it interrupts checkpoint
       operations that are in process.
    8. Enhanced the LIKE and GLOB matching algorithm to be faster for
       cases when the pattern contains multiple wildcards.
    9. Added the SQLITE_FCNTL_WIN32_GET_HANDLE file control opcode.
   10. Added ".mode quote" to the command-line shell.
   11. Added ".lint fkey-indexes" to the command-line shell.
   12. Added the .imposter dot-command to the command-line shell.
   13. Added the remember(V,PTR) SQL function as a loadable extension.
   14. Rename the SQLITE_OMIT_BUILTIN_TEST compile-time option to
       SQLITE_UNTESTABLE to better reflect the implications of using it.
       Bug Fixes:
   15. Fix a long-standing bug in the query planner that caused incorrect
       results on a LEFT JOIN where the left-hand table is a subquery and
       the join constraint is a bare column name coming from the left-hand
       subquery. Ticket 2df0107b.
   16. Correctly handle the integer literal -0x8000000000000000 in the
       query planner.
       Hashes:
   17. SQLITE_SOURCE_ID: "2017-01-02 11:57:58
       04ac0b75b1716541b2b97704f4809cb7ef19cccf"
   18. SHA1 for sqlite3.c: e2920fb885569d14197c9b7958e6f1db573ee669

  2016-11-28 (3.15.2)

    1. Multiple bug fixes to the row value logic that was introduced in
       version 3.15.0.
    2. Fix a NULL pointer dereference in ATTACH/DETACH following a
       maliciously constructed syntax error. Ticket 2f1b168ab4d4844.
    3. Fix a crash that can occur following an out-of-memory condition in
       the built-in instr() function.
    4. In the JSON extension, fix the JSON validator so that it correctly
       rejects invalid backslash escapes within strings.
       Hashes:
    5. SQLITE_SOURCE_ID: "2016-11-28 19:13:37
       bbd85d235f7037c6a033a9690534391ffeacecc8"
    6. SHA1 for sqlite3.c: 06d77b42a3e70609f8d4bbb97caf53652f1082cb

  2016-11-04 (3.15.1)

    1. Added SQLITE_FCNTL_WIN32_GET_HANDLE file control opcode.
    2. Fix the VACUUM command so that it spills excess content to disk
       rather than holding everything in memory, and possible causing an
       out-of-memory error for larger database files. This fixes an issue
       introduced by version 3.15.0.
    3. Fix a case (present since 3.8.0 - 2013-08-26) where OR-connected
       terms in the ON clause of a LEFT JOIN might cause incorrect
       results. Ticket 34a579141b2c5ac.
    4. Fix a case where the use of row values in the ON clause of a LEFT
       JOIN might cause incorrect results. Ticket fef4bb4bd9185ec8f.
       Hashes:
    5. SQLITE_SOURCE_ID: "2016-11-04 12:08:49
       1136863c76576110e710dd5d69ab6bf347c65e36"
    6. SHA1 for sqlite3.c: e7c26a7be3e431dd06898f8d262c4ef240c07366

  2016-10-14 (3.15.0)

    1. Added support for row values.
    2. Allow deterministic SQL functions in the WHERE clause of a partial
       index.
    3. Added the "modeof=filename" URI parameter on the unix VFS
    4. Added support for SQLITE_DBCONFIG_MAINDBNAME.
    5. Added the ability to VACUUM an ATTACH-ed database.
    6. Enhancements to the command-line shell:
         a. Add the ".testcase" and ".check" dot-commands.
         b. Added the --new option to the ".open" dot-command, causing any
            prior content in the database to be purged prior to opening.
    7. Enhance the fts5vocab virtual table to handle "ORDER BY term"
       efficiently.
    8. Miscellaneous micro-optimizations reduce CPU usage by more than 7%
       on common workloads. Most optimization in this release has been on
       the front-end (sqlite3_prepare_v2()).
       Bug Fixes:
    9. The multiply operator now correctly detects 64-bit integer overflow
       and promotes to floating point in all corner-cases. Fix for ticket
       1ec41379c9c1e400.
   10. Correct handling of columns with redundant unique indexes when
       those columns are used on the LHS of an IN operator. Fix for ticket
       0eab1ac759.
   11. Skip NULL entries on range queries in indexes on expressions. Fix
       for ticket 4baa46491212947.
   12. Ensure that the AUTOINCREMENT counters in the sqlite_sequence table
       are initialized doing "Xfer Optimization" on "INSERT ... SELECT"
       statements. Fix for ticket 7b3328086a5c116c.
   13. Make sure the ORDER BY LIMIT optimization (from check-in
       559733b09e) works with IN operators on INTEGER PRIMARY KEYs. Fix
       for ticket 96c1454c
       Hashes:
   14. SQLITE_SOURCE_ID: "2016-10-14 10:20:30
       707875582fcba352b4906a595ad89198d84711d8"
   15. SHA1 for sqlite3.c: fba106f8f6493c66eeed08a2dfff0907de54ae76

  2016-09-12 (3.14.2)

    1. Improved support for using the STDCALL calling convention in
       winsqlite3.dll.
    2. Fix the sqlite3_trace_v2() interface so that it is disabled if
       either the callback or the mask arguments are zero, in accordance
       with the documentation.
    3. Fix commenting errors and improve the comments generated on EXPLAIN
       listings when the -DSQLITE_ENABLE_EXPLAIN_COMMENTS compile-time
       option is used.
    4. Fix the ".read" command in the command-line shell so that it
       understands that its input is not interactive.
    5. Correct affinity computations for a SELECT on the RHS of an IN
       operator. Fix for ticket 199df4168c.
    6. The ORDER BY LIMIT optimization is not valid unless the inner-most
       IN operator loop is actually used by the query plan. Fix for ticket
       0c4df46116e90f92.
    7. Fix an internal code generator problem that was causing some DELETE
       operations to no-op. Ticket ef360601
       Hashes:
    8. SQLITE_SOURCE_ID: "2016-09-12 18:50:49
       29dbef4b8585f753861a36d6dd102ca634197bd6"
    9. SHA1 for sqlite3.c: bcc4a1989db45e7f223191f2d0f66c1c28946383

  2016-08-11 (3.14.1)

    1. A performance enhancement to the page-cache "truncate" operation
       reduces COMMIT time by dozens of milliseconds on systems with a
       large page cache.
    2. Fix to the --rbu option of sqldiff.
       Hashes:
    3. SQLITE_SOURCE_ID: "2016-08-11 18:53:32
       a12d8059770df4bca59e321c266410344242bf7b"
    4. SHA1 for sqlite3.c: d545b24892278272ce4e40e0567d69c8babf12ea

  2016-08-08 (3.14)

   [sqlitepie.jpg]

         Celebrating the SQLite "π release" with a home-baked pie.
    1. Added support for WITHOUT ROWID virtual tables.
    2. Improved the query planner so that the OR optimization can be used
       on virtual tables even if one or more of the disjuncts use the
       LIKE, GLOB, REGEXP, MATCH operators.
    3. Added the CSV virtual table for reading RFC 4180 formatted
       comma-separated value files.
    4. Added the carray() table-valued function extension.
    5. Enabled persistent loadable extensions using the new
       SQLITE_OK_LOAD_PERMANENTLY return code from the extension entry
       point.
    6. Added the SQLITE_DBSTATUS_CACHE_USED_SHARED option to
       sqlite3_db_status().
    7. Add the vfsstat.c loadable extension - a VFS shim that measures I/O
       together with an eponymous virtual table that provides access to
       the measurements.
    8. Improved algorithm for running queries with both an ORDER BY and a
       LIMIT where only the inner-most loop naturally generates rows in
       the correct order.
    9. Enhancements to Lemon parser generator, so that it generates a
       faster parser.
   10. The PRAGMA compile_options command now attempts to show the version
       number of the compiler that generated the library.
   11. Enhance PRAGMA table_info so that it provides information about
       eponymous virtual tables.
   12. Added the "win32-none" VFS, analogous to the "unix-none" VFS, that
       works like the default "win32" VFS except that it ignores all file
       locks.
   13. The query planner uses a full scan of a partial index instead of a
       full scan of the main table, in cases where that makes sense.
   14. Allow table-valued functions to appear on the right-hand side of an
       IN operator.
   15. Created the dbhash.exe command-line utility.
   16. Added two new C-language interfaces: sqlite3_expanded_sql() and
       sqlite3_trace_v2(). These new interfaces subsume the functions of
       sqlite3_trace() and sqlite3_profile() which are now deprecated.
   17. Added the json_quote() SQL function to the json1 extension.
   18. Disable the authorizer callback while reparsing the schema.
   19. Added the SQLITE_ENABLE_UNKNOWN_SQL_FUNCTION compile-time option
       and turned that option on by default when building the command-line
       shell.
       Bug Fixes:
   20. Fix the ALTER TABLE command so that it does not corrupt descending
       indexes when adding a column to a legacy file format database.
       Ticket f68bf68513a1c15f
   21. Fix a NULL-pointer dereference/crash that could occurs when a
       transitive WHERE clause references a non-existent collating
       sequence. Ticket e8d439c77685eca6.
   22. Improved the cost estimation for an index scan which includes a
       WHERE clause that can be partially or fully evaluated using columns
       in the index and without having to do a table lookup. This fixes a
       performance regression that occurred for some obscure queries
       following the ORDER BY LIMIT optimization introduced in version
       3.12.0.
       Hashes:
   23. SQLITE_SOURCE_ID: "2016-08-08 13:40:27
       d5e98057028abcf7217d0d2b2e29bbbcdf09d6de"
   24. SHA1 for sqlite3.c: 234a3275d03a287434ace3ccdf1afb208e6b0e92

  2016-05-18 (3.13.0)

    1. Postpone I/O associated with TEMP files for as long as possible,
       with the hope that the I/O can ultimately be avoided completely.
    2. Merged the session extension into trunk.
    3. Added the ".auth ON|OFF" command to the command-line shell.
    4. Added the "--indent" option to the ".schema" and ".fullschema"
       commands of the command-line shell, to turn on pretty-printing.
    5. Added the ".eqp full" option to the command-line shell, that does
       both EXPLAIN and EXPLAIN QUERY PLAN on each statement that is
       evaluated.
    6. Improved unicode filename handling in the command-line shell on
       Windows.
    7. Improved resistance against goofy query planner decisions caused by
       incomplete or incorrect modifications to the sqlite_stat1 table by
       the application.
    8. Added the
       sqlite3_db_config(db,SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION)
       interface which allows the sqlite3_load_extension() C-API to be
       enabled while keeping the load_extension() SQL function disabled
       for security.
    9. Change the temporary directory search algorithm on Unix to allow
       directories with write and execute permission, but without read
       permission, to serve as temporary directories. Apply this same
       standard to the "." fallback directory.
       Bug Fixes:
   10. Fix a problem with the multi-row one-pass DELETE optimization that
       was causing it to compute incorrect answers with a self-referential
       subquery in the WHERE clause. Fix for ticket dc6ebeda9396087
   11. Fix a possible segfault with DELETE when table is a rowid table
       with an INTEGER PRIMARY KEY and the WHERE clause contains a OR and
       the table has one or more indexes that are able to trigger the OR
       optimization, but none of the indexes reference any table columns
       other than the INTEGER PRIMARY KEY. Ticket 16c9801ceba49.
   12. When checking for the WHERE-clause push-down optimization, verify
       that all terms of the compound inner SELECT are non-aggregate, not
       just the last term. Fix for ticket f7f8c97e97597.
   13. Fix a locking race condition in Windows that can occur when two or
       more processes attempt to recover the same hot journal at the same
       time.
       Hashes:
   14. SQLITE_SOURCE_ID: "2016-05-18 10:57:30
       fc49f556e48970561d7ab6a2f24fdd7d9eb81ff2"
   15. SHA1 for sqlite3.c: 9b9171b1e6ce7a980e6b714e9c0d9112657ad552
       Bug fixes backported into patch release 3.12.2 (2016-04-18):
   16. Fix a backwards compatibility problem in version 3.12.0 and 3.12.1:
       Columns declared as "INTEGER" PRIMARY KEY (with quotes around the
       datatype keyword) were not being recognized as an INTEGER PRIMARY
       KEY, which resulted in an incompatible database file. Ticket
       7d7525cb01b68
   17. Fix a bug (present since version 3.9.0) that can cause the DELETE
       operation to miss rows if PRAGMA reverse_unordered_selects is
       turned on. Ticket a306e56ff68b8fa5
   18. Fix a bug in the code generator that can cause incorrect results if
       two or more virtual tables are joined and the virtual table used in
       outer loop of the join has an IN operator constraint.
   19. Correctly interpret negative "PRAGMA cache_size" values when
       determining the cache size used for sorting large amounts of data.
       Bug fixes backported into patch release 3.12.1 (2016-04-08):
   20. Fix a boundary condition error introduced by version 3.12.0 that
       can result in a crash during heavy SAVEPOINT usage. Ticket
       7f7f8026eda38.
   21. Fix views so that they inherit column datatypes from the table that
       they are defined against, when possible.
   22. Fix the query planner so that IS and IS NULL operators are able to
       drive an index on a LEFT OUTER JOIN.

  2016-04-18 (3.12.2)

    1. Fix a backwards compatibility problem in version 3.12.0 and 3.12.1:
       Columns declared as "INTEGER" PRIMARY KEY (with quotes around the
       datatype keyword) were not being recognized as an INTEGER PRIMARY
       KEY, which resulted in an incompatible database file. Ticket
       7d7525cb01b68
    2. Fix a bug (present since version 3.9.0) that can cause the DELETE
       operation to miss rows if PRAGMA reverse_unordered_selects is
       turned on. Ticket a306e56ff68b8fa5
    3. Fix a bug in the code generator that can cause incorrect results if
       two or more virtual tables are joined and the virtual table used in
       outer loop of the join has an IN operator constraint.
    4. Correctly interpret negative "PRAGMA cache_size" values when
       determining the cache size used for sorting large amounts of data.
       Hashes:
    5. SQLITE_SOURCE_ID: "2016-04-18 17:30:31
       92dc59fd5ad66f646666042eb04195e3a61a9e8e"
    6. SHA1 for sqlite3.c: de5a5898ebd3a3477d4652db143746d008b24c83

  2016-04-08 (3.12.1)

    1. Fix a boundary condition error introduced by version 3.12.0 that
       can result in a crash during heavy SAVEPOINT usage. Ticket
       7f7f8026eda38.
    2. Fix views so that they inherit column datatypes from the table that
       they are defined against, when possible.
    3. Fix the query planner so that IS and IS NULL operators are able to
       drive an index on a LEFT OUTER JOIN.
       Hashes:
    4. SQLITE_SOURCE_ID: "2016-04-08 15:09:49
       fe7d3b75fe1bde41511b323925af8ae1b910bc4d"
    5. SHA1 for sqlite3.c: ebb18593350779850e3e1a930eb84a70fca8c1d1

  2016-04-01 (3.9.3)

    1. Backport a simple query planner optimization that allows the IS
       operator to drive an index on a LEFT OUTER JOIN. No other changes
       from the version 3.9.2 baseline.

  2016-03-29 (3.12.0)

   Potentially Disruptive Change:
    1. The SQLITE_DEFAULT_PAGE_SIZE is increased from 1024 to 4096. The
       SQLITE_DEFAULT_CACHE_SIZE is changed from 2000 to -2000 so the same
       amount of cache memory is used by default. See the application note
       on the version 3.12.0 page size change for further information.
       Performance enhancements:
    2. Enhancements to the Lemon parser generator so that it creates a
       smaller and faster SQL parser.
    3. Only create master journal files if two or more attached databases
       are all modified, do not have PRAGMA synchronous set to OFF, and do
       not have the journal_mode set to OFF, MEMORY, or WAL.
    4. Only create statement journal files when their size exceeds a
       threshold. Otherwise the journal is held in memory and no I/O
       occurs. The threshold can be configured at compile-time using
       SQLITE_STMTJRNL_SPILL or at start-time using
       sqlite3_config(SQLITE_CONFIG_STMTJRNL_SPILL).
    5. The query planner is able to optimize IN operators on virtual
       tables even if the xBestIndex method does not set the
       sqlite3_index_constraint_usage.omit flag of the virtual table
       column to the left of the IN operator.
    6. The query planner now does a better job of optimizing virtual table
       accesses in a 3-way or higher join where constraints on the virtual
       table are split across two or more other tables of the join.
    7. More efficient handling of application-defined SQL functions,
       especially in cases where the application defines hundreds or
       thousands of custom functions.
    8. The query planner considers the LIMIT clause when estimating the
       cost of ORDER BY.
    9. The configure script (on unix) automatically detects pread() and
       pwrite() and sets compile-time options to use those OS interfaces
       if they are available.
   10. Reduce the amount of memory needed to hold the schema.
   11. Other miscellaneous micro-optimizations for improved performance
       and reduced memory usage.
       New Features:
   12. Added the SQLITE_DBCONFIG_ENABLE_FTS3_TOKENIZER option to
       sqlite3_db_config() which allows the two-argument version of the
       fts3_tokenizer() SQL function to be enabled or disabled at
       run-time.
   13. Added the sqlite3rbu_bp_progress() interface to the RBU extension.
   14. The PRAGMA defer_foreign_keys=ON statement now also disables
       RESTRICT actions on foreign key.
   15. Added the sqlite3_system_errno() interface.
   16. Added the SQLITE_DEFAULT_SYNCHRONOUS and
       SQLITE_DEFAULT_WAL_SYNCHRONOUS compile-time options. The
       SQLITE_DEFAULT_SYNCHRONOUS compile-time option replaces the
       SQLITE_EXTRA_DURABLE option, which is no longer supported.
   17. Enhanced the ".stats" command in the command-line shell to show
       more information about I/O performance obtained from /proc, when
       available.
       Bug fixes:
   18. Make sure the sqlite3_set_auxdata() values from multiple triggers
       within a single statement do not interfere with one another. Ticket
       dc9b1c91.
   19. Fix the code generator for expressions of the form "x IN
       (SELECT...)" where the SELECT statement on the RHS is a correlated
       subquery. Ticket 5e3c886796e5512e.
   20. Fix a harmless TSAN warning associated with the
       sqlite3_db_readonly() interface.
       Hashes:
   21. SQLITE_SOURCE_ID: "2016-03-29 10:14:15
       e9bb4cf40f4971974a74468ef922bdee481c988b"
   22. SHA1 for sqlite3.c: cba2be96d27cb51978cd4a200397a4ad178986eb

  2016-03-03 (3.11.1)

    1. Improvements to the Makefiles and build scripts used by
       VisualStudio.
    2. Fix an FTS5 issue in which the 'optimize' command could cause index
       corruption.
    3. Fix a buffer overread that might occur if FTS5 is used to query a
       corrupt database file.
    4. Increase the maximum "scope" value for the spellfix1 extension from
       6 to 30.
    5. SQLITE_SOURCE_ID: "2016-03-03 16:17:53
       f047920ce16971e573bc6ec9a48b118c9de2b3a7"
    6. SHA1 for sqlite3.c: 3da832fd2af36eaedb05d61a8f4c2bb9f3d54265

  2016-02-15 (3.11.0)

   General improvements:
    1. Enhanced WAL mode so that it works efficiently with transactions
       that are larger than the cache_size.
    2. Added the FTS5 detail option.
    3. Added the "EXTRA" option to PRAGMA synchronous that does a sync of
       the containing directory when a rollback journal is unlinked in
       DELETE mode, for better durability. The SQLITE_EXTRA_DURABLE
       compile-time option enables PRAGMA synchronous=EXTRA by default.
    4. Enhanced the query planner so that it is able to use a covering
       index as part of the OR optimization.
    5. Avoid recomputing NOT NULL and CHECK constraints on unchanged
       columns in UPDATE statement.
    6. Many micro-optimizations, resulting in a library that is faster
       than the previous release.
       Enhancements to the command-line shell:
    7. By default, the shell is now in "auto-explain" mode. The output of
       EXPLAIN commands is automatically formatted.
    8. Added the ".vfslist" dot-command.
    9. The SQLITE_ENABLE_EXPLAIN_COMMENTS compile-time option is now
       turned on by default in the standard builds.
       Enhancements to the TCL Interface:
   10. If a database connection is opened with the "-uri 1" option, then
       URI filenames are honored by the "backup" and "restore" commands.
   11. Added the "-sourceid" option to the "sqlite3" command.
       Makefile improvements:
   12. Improved pthreads detection in configure scripts.
   13. Add the ability to do MSVC Windows builds from the amalgamation
       tarball.
       Bug fixes
   14. Fix an issue with incorrect sharing of VDBE temporary registers
       between co-routines that could cause incorrect query results in
       obscure cases. Ticket d06a25c84454a.
   15. Fix a problem in the sqlite3_result_subtype() interface that could
       cause problems for the json1 extension under obscure circumstances.
       Fix for ticket f45ac567eaa9f9.
   16. Escape control characters in JSON strings. Fix for ticket
       ad2559db380abf8.
   17. Reenable the xCurrentTime and xGetLastError methods in the built-in
       unix VFSes as long as SQLITE_OMIT_DEPRECATED is not defined.
       Backwards Compatibility:
   18. Because of continuing security concerns, the two-argument version
       of of the seldom-used and little-known fts3_tokenizer() function is
       disabled unless SQLite is compiled with the
       SQLITE_ENABLE_FTS3_TOKENIZER.
       Hashes:
   19. SQLITE_SOURCE_ID: "2016-02-15 17:29:24
       3d862f207e3adc00f78066799ac5a8c282430a5f"
   20. SHA1 for sqlite3.c: df01436c5fcfe72d1a95bc172158219796e1a90b

  2016-01-20 (3.10.2)

   Critical bug fix:
    1. Version 3.10.0 introduced a case-folding bug in the LIKE operator
       which is fixed by this patch release. Ticket 80369eddd5c94.
       Other miscellaneous bug fixes:
    2. Fix a use-after-free that can occur when SQLite is compiled with
       -DSQLITE_HAS_CODEC.
    3. Fix the build so that it works with -DSQLITE_OMIT_WAL.
    4. Fix the configure script for the amalgamation so that the
       --readline option works again on Raspberry PIs.
       Hashes:
    5. SQLITE_SOURCE_ID: "2016-01-20 15:27:19
       17efb4209f97fb4971656086b138599a91a75ff9"
    6. SHA1 for sqlite3.c: f7088b19d97cd7a1c805ee95c696abd54f01de4f

  2016-01-14 (3.10.1)

   New feature:
    1. Add the SQLITE_FCNTL_JOURNAL_POINTER file control.
       Bug fix:
    2. Fix a 16-month-old bug in the query planner that could generate
       incorrect results when a scalar subquery attempts to use the block
       sorting optimization. Ticket cb3aa0641d9a4.
       Hashes:
    3. SQLITE_SOURCE_ID: "2016-01-13 21:41:56
       254419c36766225ca542ae873ed38255e3fb8588"
    4. SHA1 for sqlite3.c: 1398ba8e4043550a533cdd0834bfdad1c9eab0f4

  2016-01-06 (3.10.0)

   General improvements:
    1. Added support for LIKE, GLOB, and REGEXP operators on virtual
       tables.
    2. Added the colUsed field to sqlite3_index_info for use by the
       sqlite3_module.xBestIndex method.
    3. Enhance the PRAGMA cache_spill statement to accept a 32-bit integer
       parameter which is the threshold below which cache spilling is
       prohibited.
    4. On unix, if a symlink to a database file is opened, then the
       corresponding journal files are based on the actual filename, not
       the symlink name.
    5. Added the "--transaction" option to sqldiff.
    6. Added the sqlite3_db_cacheflush() interface.
    7. Added the sqlite3_strlike() interface.
    8. When using memory-mapped I/O map the database file read-only so
       that stray pointers and/or array overruns in the application cannot
       accidentally modify the database file.
    9. Added the experimental sqlite3_snapshot_get(),
       sqlite3_snapshot_open(), and sqlite3_snapshot_free() interfaces.
       These are subject to change or removal in a subsequent release.
   10. Enhance the 'utc' modifier in the date and time functions so that
       it is a no-op if the date/time is known to already be in UTC. (This
       is not a compatibility break since the behavior has long been
       documented as "undefined" in that case.)
   11. Added the json_group_array() and json_group_object() SQL functions
       in the json extension.
   12. Added the SQLITE_LIKE_DOESNT_MATCH_BLOBS compile-time option.
   13. Many small performance optimizations.
       Portability enhancements:
   14. Work around a sign-extension bug in the optimizer of the HP C
       compiler on HP/UX. (details)
       Enhancements to the command-line shell:
   15. Added the ".changes ON|OFF" and ".vfsinfo" dot-commands.
   16. Translate between MBCS and UTF8 when running in cmd.exe on Windows.
       Enhancements to makefiles:
   17. Added the --enable-editline and --enable-static-shell options to
       the various autoconf-generated configure scripts.
   18. Omit all use of "awk" in the makefiles, to make building easier for
       MSVC users.
       Important fixes:
   19. Fix inconsistent integer to floating-point comparison operations
       that could result in a corrupt index if the index is created on a
       table column that contains both large integers and floating point
       values of similar magnitude. Ticket 38a97a87a6.
   20. Fix an infinite-loop in the query planner that could occur on
       malformed common table expressions.
   21. Various bug fixes in the sqldiff tool.
       Hashes:
   22. SQLITE_SOURCE_ID: "2016-01-06 11:01:07
       fd0a50f0797d154fefff724624f00548b5320566"
   23. SHA1 for sqlite3.c: b92ca988ebb6df02ac0c8f866dbf3256740408ac

  2015-11-02 (3.9.2)

    1. Fix the schema parser so that it interprets certain (obscure and
       ill-formed) CREATE TABLE statements the same as legacy. Fix for
       ticket ac661962a2aeab3c331
    2. Fix a query planner problem that could result in an incorrect
       answer due to the use of automatic indexing in subqueries in the
       FROM clause of a correlated scalar subqueries. Fix for ticket
       8a2adec1.
    3. SQLITE_SOURCE_ID: "2015-11-02 18:31:45
       bda77dda9697c463c3d0704014d51627fceee328"
    4. SHA1 for sqlite3.c: 1c4013876f50bbaa3e6f0f98e0147c76287684c1

  2015-10-16 (3.9.1)

    1. Fix the json1 extension so that it does not recognize ASCII
       form-feed as a whitespace character, in order to comply with
       RFC-7159. Fix for ticket 57eec374ae1d0a1d
    2. Add a few #ifdef and build script changes to address compilation
       issues that appeared after the 3.9.0 release.
    3. SQLITE_SOURCE_ID: ""2015-10-16 17:31:12
       767c1727fec4ce11b83f25b3f1bfcfe68a2c8b02"
    4. SHA1 for sqlite3.c: 5e6d1873a32d82c2cf8581f143649940cac8ae49

  2015-10-14 (3.9.0)

   Policy Changes:
    1. The version numbering conventions for SQLite are revised to use the
       emerging standard of semantic versioning.
       New Features And Enhancements:
    2. Added the json1 extension module in the source tree, and in the
       amalgamation. Enable support using the SQLITE_ENABLE_JSON1
       compile-time option.
    3. Added Full Text Search version 5 (FTS5) to the amalgamation,
       enabled using SQLITE_ENABLE_FTS5. FTS5 will be considered
       "experimental" (subject to incompatible changes) for at least one
       more release cycle.
    4. The CREATE VIEW statement now accepts an optional list of column
       names following the view name.
    5. Added support for indexes on expressions.
    6. Added support for table-valued functions in the FROM clause of a
       SELECT statement.
    7. Added support for eponymous virtual tables.
    8. A VIEW may now reference undefined tables and functions when
       initially created. Missing tables and functions are reported when
       the VIEW is used in a query.
    9. Added the sqlite3_value_subtype() and sqlite3_result_subtype()
       interfaced (used by the json1 extension).
   10. The query planner is now able to use partial indexes that contain
       AND-connected terms in the WHERE clause.
   11. The sqlite3_analyzer.exe utility is updated to report the depth of
       each btree and to show the average fanout for indexes and WITHOUT
       ROWID tables.
   12. Enhanced the dbstat virtual table so that it can be used as a
       table-valued function where the argument is the schema to be
       analyzed.
       Other changes:
   13. The sqlite3_memory_alarm() interface, which has been deprecated and
       undocumented for 8 years, is changed into a no-op.
       Important fixes:
   14. Fixed a critical bug in the SQLite Encryption Extension that could
       cause the database to become unreadable and unrecoverable if a
       VACUUM command changed the size of the encryption nonce.
   15. Added a memory barrier in the implementation of
       sqlite3_initialize() to help ensure that it is thread-safe.
   16. Fix the OR optimization so that it always ignores subplans that do
       not use an index.
   17. Do not apply the WHERE-clause pushdown optimization on terms that
       originate in the ON or USING clause of a LEFT JOIN. Fix for ticket
       c2a19d81652f40568c.
   18. SQLITE_SOURCE_ID: "2015-10-14 12:29:53
       a721fc0d89495518fe5612e2e3bbc60befd2e90d"
   19. SHA1 for sqlite3.c: c03e47e152ddb9c342b84ffb39448bf4a2bd4288

  2015-07-29 (3.8.11.1)

    1. Restore an undocumented side-effect of PRAGMA cache_size: force the
       database schema to be parsed if the database has not been
       previously accessed.
    2. Fix a long-standing problem in sqlite3_changes() for WITHOUT ROWID
       tables that was reported a few hours after the 3.8.11 release.
    3. SQLITE_SOURCE_ID: "2015-07-29 20:00:57
       cf538e2783e468bbc25e7cb2a9ee64d3e0e80b2f"
    4. SHA1 for sqlite3.c: 3be71d99121fe5b17f057011025bcf84e7cc6c84

  2015-07-27 (3.8.11)

    1. Added the experimental RBU extension. Note that this extension is
       experimental and subject to change in incompatible ways.
    2. Added the experimental FTS5 extension. Note that this extension is
       experimental and subject to change in incompatible ways.
    3. Added the sqlite3_value_dup() and sqlite3_value_free() interfaces.
    4. Enhance the spellfix1 extension to support ON CONFLICT clauses.
    5. The IS operator is now able to drive indexes.
    6. Enhance the query planner to permit automatic indexing on
       FROM-clause subqueries that are implemented by co-routine.
    7. Disallow the use of "rowid" in common table expressions.
    8. Added the PRAGMA cell_size_check command for better and earlier
       detection of database file corruption.
    9. Added the matchinfo 'b' flag to the matchinfo() function in FTS3.
   10. Improved fuzz-testing of database files, with fixes for problems
       found.
   11. Add the fuzzcheck test program and automatically run this program
       using both SQL and database test cases on "make test".
   12. Added the SQLITE_MUTEX_STATIC_VFS1 static mutex and use it in the
       Windows VFS.
   13. The sqlite3_profile() callback is invoked (by sqlite3_reset() or
       sqlite3_finalize()) for statements that did not run to completion.
   14. Enhance the page cache so that it can preallocate a block of memory
       to use for the initial set page cache lines. Set the default
       preallocation to 100 pages. Yields about a 5% performance increase
       on common workloads.
   15. Miscellaneous micro-optimizations result in 22.3% more work for the
       same number of CPU cycles relative to the previous release. SQLite
       now runs twice as fast as version 3.8.0 and three times as fast as
       version 3.3.9. (Measured using cachegrind on the speedtest1.c
       workload on Ubuntu 14.04 x64 with gcc 4.8.2 and -Os. Your
       performance may vary.)
   16. Added the sqlite3_result_zeroblob64() and sqlite3_bind_zeroblob64()
       interfaces.
       Important bug fixes:
   17. Fix CREATE TABLE AS so that columns of type TEXT never end up
       holding an INT value. Ticket f2ad7de056ab1dc9200
   18. Fix CREATE TABLE AS so that it does not leave NULL entries in the
       sqlite_master table if the SELECT statement on the right-hand side
       aborts with an error. Ticket 873cae2b6e25b
   19. Fix the skip-scan optimization so that it works correctly when the
       OR optimization is used on WITHOUT ROWID tables. Ticket
       8fd39115d8f46
   20. Fix the sqlite3_memory_used() and sqlite3_memory_highwater()
       interfaces so that they actually do provide a 64-bit answer.
       Hashes:
   21. SQLITE_SOURCE_ID: "2015-07-27 13:49:41
       b8e92227a469de677a66da62e4361f099c0b79d0"
   22. SHA1 for sqlite3.c: 719f6891abcd9c459b5460b191d731cd12a3643e

  2015-05-20 (3.8.10.2)

    1. Fix an index corruption issue introduced by version 3.8.7. An index
       with a TEXT key can be corrupted by an INSERT into the
       corresponding table if the table has two nested triggers that
       convert the key value to INTEGER and back to TEXT again. Ticket
       34cd55d68e0
    2. SQLITE_SOURCE_ID: "2015-05-20 18:17:19
       2ef4f3a5b1d1d0c4338f8243d40a2452cc1f7fe4"
    3. SHA1 for sqlite3.c: 638abb77965332c956dbbd2c8e4248e84da4eb63

  2015-05-09 (3.8.10.1)

    1. Make sqlite3_compileoption_used() responsive to the
       SQLITE_ENABLE_DBSTAT_VTAB compile-time option.
    2. Fix a harmless warning in the command-line shell on some versions
       of MSVC.
    3. Fix minor issues with the dbstat virtual table.
    4. SQLITE_SOURCE_ID: "2015-05-09 12:14:55
       05b4b1f2a937c06c90db70c09890038f6c98ec40"
    5. SHA1 for sqlite3.c: 85e4e1c08c7df28ef61bb9759a0d466e0eefbaa2

  2015-05-07 (3.8.10)

    1. Added the sqldiff.exe utility program for computing the differences
       between two SQLite database files.
    2. Added the matchinfo y flag to the matchinfo() function of FTS3.
    3. Performance improvements for ORDER BY, VACUUM, CREATE INDEX, PRAGMA
       integrity_check, and PRAGMA quick_check.
    4. Fix many obscure problems discovered while SQL fuzzing.
    5. Identify all methods for important objects in the interface
       documentation. (example)
    6. Made the American Fuzzy Lop fuzzer a standard part of SQLite's
       testing strategy.
    7. Add the ".binary" and ".limits" commands to the command-line shell.
    8. Make the dbstat virtual table part of standard builds when compiled
       with the SQLITE_ENABLE_DBSTAT_VTAB option.
    9. SQLITE_SOURCE_ID: "2015-05-07 11:53:08
       cf975957b9ae671f34bb65f049acf351e650d437"
   10. SHA1 for sqlite3.c: 0b34f0de356a3f21b9dfc761f3b7821b6353c570

  2015-04-08 (3.8.9)

    1. Add VxWorks-7 as an officially supported and tested platform.
    2. Added the sqlite3_status64() interface.
    3. Fix memory size tracking so that it works even if SQLite uses more
       than 2GiB of memory.
    4. Added the PRAGMA index_xinfo command.
    5. Fix a potential 32-bit integer overflow problem in the
       sqlite3_blob_read() and sqlite3_blob_write() interfaces.
    6. Ensure that prepared statements automatically reset on extended
       error codes of SQLITE_BUSY and SQLITE_LOCKED even when compiled
       using SQLITE_OMIT_AUTORESET.
    7. Correct miscounts in the sqlite3_analyzer.exe utility related to
       WITHOUT ROWID tables.
    8. Added the ".dbinfo" command to the command-line shell.
    9. Improve the performance of fts3/4 queries that use the OR operator
       and at least one auxiliary fts function.
   10. Fix a bug in the fts3 snippet() function causing it to omit leading
       separator characters from snippets that begin with the first token
       in a column.
   11. SQLITE_SOURCE_ID: "2015-04-08 12:16:33
       8a8ffc862e96f57aa698f93de10dee28e69f6e09"
   12. SHA1 for sqlite3.c: 49f1c3ae347e1327b5aaa6c7f76126bdf09c6f42

  2015-02-25 (3.8.8.3)

    1. Fix a bug (ticket 2326c258d02ead33) that can lead to incorrect
       results if the qualifying constraint of a partial index appears in
       the ON clause of a LEFT JOIN.
    2. Added the ability to link against the "linenoise" command-line
       editing library in unix builds of the command-line shell.
    3. SQLITE_SOURCE_ID: "2015-02-25 13:29:11
       9d6c1880fb75660bbabd693175579529785f8a6b"
    4. SHA1 for sqlite3.c: 74ee38c8c6fd175ec85a47276dfcefe8a262827a

  2015-01-30 (3.8.8.2)

    1. Enhance sqlite3_wal_checkpoint_v2(TRUNCATE) interface so that it
       truncates the WAL file even if there is no checkpoint work to be
       done.
    2. SQLITE_SOURCE_ID: "2015-01-30 14:30:45
       7757fc721220e136620a89c9d28247f28bbbc098"
    3. SHA1 for sqlite3.c: 85ce79948116aa9a087ec345c9d2ce2c1d3cd8af

  2015-01-20 (3.8.8.1)

    1. Fix a bug in the sorting logic, present since version 3.8.4, that
       can cause output to appear in the wrong order on queries that
       contains an ORDER BY clause, a LIMIT clause, and that have
       approximately 60 or more columns in the result set. Ticket
       f97c4637102a3ae72b79.
    2. SQLITE_SOURCE_ID: "2015-01-20 16:51:25
       f73337e3e289915a76ca96e7a05a1a8d4e890d55"
    3. SHA1 for sqlite3.c: 33987fb50dcc09f1429a653d6b47672f5a96f19e

  2015-01-16 (3.8.8)

   New Features:
    1. Added the PRAGMA data_version command that can be used to determine
       if a database file has been modified by another process.
    2. Added the SQLITE_CHECKPOINT_TRUNCATE option to the
       sqlite3_wal_checkpoint_v2() interface, with corresponding
       enhancements to PRAGMA wal_checkpoint.
    3. Added the sqlite3_stmt_scanstatus() interface, available only when
       compiled with SQLITE_ENABLE_STMT_SCANSTATUS.
    4. The sqlite3_table_column_metadata() is enhanced to work correctly
       on WITHOUT ROWID tables and to check for the existence of a a table
       if the column name parameter is NULL. The interface is now also
       included in the build by default, without requiring the
       SQLITE_ENABLE_COLUMN_METADATA compile-time option.
    5. Added the SQLITE_ENABLE_API_ARMOR compile-time option.
    6. Added the SQLITE_REVERSE_UNORDERED_SELECTS compile-time option.
    7. Added the SQLITE_SORTER_PMASZ compile-time option and
       SQLITE_CONFIG_PMASZ start-time option.
    8. Added the SQLITE_CONFIG_PCACHE_HDRSZ option to sqlite3_config()
       which makes it easier for applications to determine the appropriate
       amount of memory for use with SQLITE_CONFIG_PAGECACHE.
    9. The number of rows in a VALUES clause is no longer limited by
       SQLITE_LIMIT_COMPOUND_SELECT.
   10. Added the eval.c loadable extension that implements an eval() SQL
       function that will recursively evaluate SQL.
       Performance Enhancements:
   11. Reduce the number of memcpy() operations involved in balancing a
       b-tree, for 3.2% overall performance boost.
   12. Improvements to cost estimates for the skip-scan optimization.
   13. The automatic indexing optimization is now capable of generating a
       partial index if that is appropriate.
       Bug fixes:
   14. Ensure durability following a power loss with "PRAGMA
       journal_mode=TRUNCATE" by calling fsync() right after truncating
       the journal file.
   15. The query planner now recognizes that any column in the right-hand
       table of a LEFT JOIN can be NULL, even if that column has a NOT
       NULL constraint. Avoid trying to optimize out NULL tests in those
       cases. Fix for ticket 6f2222d550f5b0ee7ed.
   16. Make sure ORDER BY puts rows in ascending order even if the
       DISTINCT operator is implemented using a descending index. Fix for
       ticket c5ea805691bfc4204b1cb9e.
   17. Fix data races that might occur under stress when running with many
       threads in shared cache mode where some of the threads are opening
       and closing connections.
   18. Fix obscure crash bugs found by american fuzzy lop. Ticket
       a59ae93ee990a55.
   19. Work around a GCC optimizer bug (for gcc 4.2.1 on MacOS 10.7) that
       caused the R-Tree extension to compute incorrect results when
       compiled with -O3.
       Other changes:
   20. Disable the use of the strchrnul() C-library routine unless it is
       specifically enabled using the -DHAVE_STRCHRNULL compile-time
       option.
   21. Improvements to the effectiveness and accuracy of the likelihood(),
       likely(), and unlikely() SQL hint functions.
   22. SQLITE_SOURCE_ID: "2015-01-16 12:08:06
       7d68a42face3ab14ed88407d4331872f5b243fdf"
   23. SHA1 for sqlite3.c: 91aea4cc722371d58aae3d22e94d2a4165276905

  2014-12-09 (3.8.7.4)

    1. Bug fix: Add in a mutex that was omitted from the previous release.
    2. SQLITE_SOURCE_ID: "2014-12-09 01:34:36
       f66f7a17b78ba617acde90fc810107f34f1a1f2e"
    3. SHA1 for sqlite3.c: 0a56693a3c24aa3217098afab1b6fecccdedfd23

  2014-12-05 (3.8.7.3)

    1. Bug fix: Ensure the cached KeyInfo objects (an internal abstraction
       not visible to the application) do not go stale when operating in
       shared cache mode and frequently closing and reopening some
       database connections while leaving other database connections on
       the same shared cache open continuously. Ticket
       e4a18565a36884b00edf.
    2. Bug fix: Recognize that any column in the right-hand table of a
       LEFT JOIN can be NULL even if the column has a NOT NULL constraint.
       Do not apply optimizations that assume the column is never NULL.
       Ticket 6f2222d550f5b0ee7ed.
    3. SQLITE_SOURCE_ID: "2014-12-05 22:29:24
       647e77e853e81a5effeb4c33477910400a67ba86"
    4. SHA1 for sqlite3.c: 3ad2f5ba3a4a3e3e51a1dac9fda9224b359f0261

  2014-11-18 (3.8.7.2)

    1. Enhance the ROLLBACK command so that pending queries are allowed to
       continue as long as the schema is unchanged. Formerly, a ROLLBACK
       would cause all pending queries to fail with an SQLITE_ABORT or
       SQLITE_ABORT_ROLLBACK error. That error is still returned if the
       ROLLBACK modifies the schema.
    2. Bug fix: Make sure that NULL results from OP_Column are fully and
       completely NULL and do not have the MEM_Ephem bit set. Ticket
       094d39a4c95ee4.
    3. Bug fix: The %c format in sqlite3_mprintf() is able to handle
       precisions greater than 70.
    4. Bug fix: Do not automatically remove the DISTINCT keyword from a
       SELECT that forms the right-hand side of an IN operator since it is
       necessary if the SELECT also contains a LIMIT. Ticket db87229497.
    5. SQLITE_SOURCE_ID: "2014-11-18 20:57:56
       2ab564bf9655b7c7b97ab85cafc8a48329b27f93"
    6. SHA1 for sqlite3.c: b2a68d5783f48dba6a8cb50d8bf69b238c5ec53a

  2014-10-29 (3.8.7.1)

    1. In PRAGMA journal_mode=TRUNCATE mode, call fsync() immediately
       after truncating the journal file to ensure that the transaction is
       durable across a power loss.
    2. Fix an assertion fault that can occur when updating the NULL value
       of a field at the end of a table that was added using ALTER TABLE
       ADD COLUMN.
    3. Do not attempt to use the strchrnul() function from the standard C
       library unless the HAVE_STRCHRNULL compile-time option is set.
    4. Fix a couple of problems associated with running an UPDATE or
       DELETE on a VIEW with a rowid in the WHERE clause.
    5. SQLITE_SOURCE_ID: "2014-10-29 13:59:56
       3b7b72c4685aa5cf5e675c2c47ebec10d9704221"
    6. SHA1 for sqlite3.c: 2d25bd1a73dc40f538f3a81c28e6efa5999bdf0c

  2014-10-17 (3.8.7)

   Performance Enhancements:
    1. Many micro-optimizations result in 20.3% more work for the same
       number of CPU cycles relative to the previous release. The
       cumulative performance increase since version 3.8.0 is 61%.
       (Measured using cachegrind on the speedtest1.c workload on Ubuntu
       13.10 x64 with gcc 4.8.1 and -Os. Your performance may vary.)
    2. The sorter can use auxiliary helper threads to increase real-time
       response. This feature is off by default and may be enabled using
       the PRAGMA threads command or the SQLITE_DEFAULT_WORKER_THREADS
       compile-time option.
    3. Enhance the skip-scan optimization so that it is able to skip index
       terms that occur in the middle of the index, not just as the
       left-hand side of the index.
    4. Improved optimization of CAST operators.
    5. Various improvements in how the query planner uses sqlite_stat4
       information to estimate plan costs.
       New Features:
    6. Added new interfaces with 64-bit length parameters:
       sqlite3_malloc64(), sqlite3_realloc64(), sqlite3_bind_blob64(),
       sqlite3_result_blob64(), sqlite3_bind_text64(), and
       sqlite3_result_text64().
    7. Added the new interface sqlite3_msize() that returns the size of a
       memory allocation obtained from sqlite3_malloc64() and its
       variants.
    8. Added the SQLITE_LIMIT_WORKER_THREADS option to sqlite3_limit() and
       PRAGMA threads command for configuring the number of available
       worker threads.
    9. The spellfix1 extension allows the application to optionally
       specify the rowid for each INSERT.
   10. Added the User Authentication extension.
       Bug Fixes:
   11. Fix a bug in the partial index implementation that might result in
       an incorrect answer if a partial index is used in a subquery or in
       a view. Ticket 98d973b8f5.
   12. Fix a query planner bug that might cause a table to be scanned in
       the wrong direction (thus reversing the order of output) when a
       DESC index is used to implement the ORDER BY clause on a query that
       has an identical GROUP BY clause. Ticket ba7cbfaedc7e6.
   13. Fix a bug in sqlite3_trace() that was causing it to sometimes fail
       to print an SQL statement if that statement needed to be
       re-prepared. Ticket 11d5aa455e0d98f3c1e6a08
   14. Fix a faulty assert() statement. Ticket 369d57fb8e5ccdff06f1
       Test, Debug, and Analysis Changes:
   15. Show ASCII-art abstract syntax tree diagrams using the
       ".selecttrace" and ".wheretrace" commands in the command-line shell
       when compiled with SQLITE_DEBUG, SQLITE_ENABLE_SELECTTRACE, and
       SQLITE_ENABLE_WHERETRACE. Also provide the sqlite3TreeViewExpr()
       and sqlite3TreeViewSelect() entry points that can be invoked from
       with the debugger to show the parse tree when stopped at a
       breakpoint.
   16. Drop support for SQLITE_ENABLE_TREE_EXPLAIN. The SELECTTRACE
       mechanism provides more useful diagnostics information.
   17. New options to the command-line shell for configuring auxiliary
       memory usage: --pagecache, --lookaside, and --scratch.
   18. SQLITE_SOURCE_ID: "2014-10-17 11:24:17
       e4ab094f8afce0817f4074e823fabe59fc29ebb4"
   19. SHA1 for sqlite3.c: 56dcf5e931a9e1fa12fc2d600cd91d3bf9b639cd

  2014-08-15 (3.8.6)

    1. Added support for hexadecimal integer literals in the SQL parser.
       (Ex: 0x123abc)
    2. Enhanced the PRAGMA integrity_check command to detect UNIQUE and
       NOT NULL constraint violations.
    3. Increase the maximum value of SQLITE_MAX_ATTACHED from 62 to 125.
    4. Increase the timeout in WAL mode before issuing an SQLITE_PROTOCOL
       error from 1 second to 10 seconds.
    5. Added the likely(X) SQL function.
    6. The unicode61 tokenizer is now included in FTS4 by default.
    7. Trigger automatic reprepares on all prepared statements when
       ANALYZE is run.
    8. Added a new loadable extension source code file to the source tree:
       fileio.c
    9. Add extension functions readfile(X) and writefile(X,Y) (using code
       copy/pasted from fileio.c in the previous bullet) to the
       command-line shell.
   10. Added the .fullschema dot-command to the command-line shell.
       Performance Enhancements:
   11. Deactivate the DISTINCT keyword on subqueries on the right-hand
       side of the IN operator.
   12. Add the capability of evaluating an IN operator as a sequence of
       comparisons as an alternative to using a table lookup. Use the
       sequence of comparisons implementation in circumstances where it is
       likely to be faster, such as when the right-hand side of the IN
       operator is small and/or changes frequently.
   13. The query planner now uses sqlite_stat4 information (created by
       ANALYZE) to help determine if the skip-scan optimization is
       appropriate.
   14. Ensure that the query planner never tries to use a self-made
       transient index in place of a schema-defined index.
   15. Other minor tweaks to improve the quality of VDBE code.
       Bug Fixes:
   16. Fix a bug in CREATE UNIQUE INDEX, introduced when WITHOUT ROWID
       support added in version 3.8.2, that allows a non-unique NOT NULL
       column to be given a UNIQUE index. Ticket 9a6daf340df99ba93c
   17. Fix a bug in R-Tree extension, introduced in the previous release,
       that can cause an incorrect results for queries that use the rowid
       of the R-Tree on the left-hand side of an IN operator. Ticket
       d2889096e7bdeac6.
   18. Fix the sqlite3_stmt_busy() interface so that it gives the correct
       answer for ROLLBACK statements that have been stepped but never
       reset.
   19. Fix a bug in that would cause a null pointer to be dereferenced if
       a column with a DEFAULT that is an aggregate function tried to usee
       its DEFAULT. Ticket 3a88d85f36704eebe1
   20. CSV output from the command-line shell now always uses CRNL for the
       row separator and avoids inserting CR in front of NLs contained in
       data.
   21. Fix a column affinity problem with the IN operator. Ticket
       9a8b09f8e6.
   22. Fix the ANALYZE command so that it adds correct samples for WITHOUT
       ROWID tables in the sqlite_stat4 table. Ticket b2fa5424e6fcb15.
   23. SQLITE_SOURCE_ID: "2014-08-15 11:46:33
       9491ba7d738528f168657adb43a198238abde19e"
   24. SHA1 for sqlite3.c: 72c64f05cd9babb9c0f9b3c82536d83be7804b1c

  2014-06-04 (3.8.5)

    1. Added support for partial sorting by index.
    2. Enhance the query planner so that it always prefers an index that
       uses a superset of WHERE clause terms relative to some other index.
    3. Improvements to the automerge command of FTS4 to better control the
       index size for a full-text index that is subject to a large number
       of updates.
    4. Added the sqlite3_rtree_query_callback() interface to R-Tree
       extension
    5. Added new URI query parameters "nolock" and "immutable".
    6. Use less memory by not remembering CHECK constraints on read-only
       database connections.
    7. Enable the OR optimization for WITHOUT ROWID tables.
    8. Render expressions of the form "x IN (?)" (with a single value in
       the list on the right-hand side of the IN operator) as if they
       where "x==?", Similarly optimize "x NOT IN (?)"
    9. Add the ".system" and ".once" commands to the command-line shell.
   10. Added the SQLITE_IOCAP_IMMUTABLE bit to the set of bits that can be
       returned by the xDeviceCharacteristics method of a VFS.
   11. Added the SQLITE_TESTCTRL_BYTEORDER test control.
       Bug Fixes:
   12. OFFSET clause ignored on queries without a FROM clause. Ticket
       07d6a0453d
   13. Assertion fault on queries involving expressions of the form "x IN
       (?)". Ticket e39d032577.
   14. Incorrect column datatype reported. Ticket a8a0d2996a
   15. Duplicate row returned on a query against a table with more than 16
       indices, each on a separate column, and all used via OR-connected
       constraints. Ticket 10fb063b11
   16. Partial index causes assertion fault on UPDATE OR REPLACE. Ticket
       2ea3e9fe63
   17. Crash when calling undocumented SQL function sqlite_rename_parent()
       with NULL parameters. Ticket 264b970c43
   18. ORDER BY ignored if the query has an identical GROUP BY. Ticket
       b75a9ca6b0
   19. The group_concat(x,'') SQL function returns NULL instead of an
       empty string when all inputs are empty strings. Ticket 55746f9e65
   20. Fix a bug in the VDBE code generator that caused crashes when doing
       an INSERT INTO ... SELECT statement where the number of columns
       being inserted is larger than the number of columns in the
       destination table. Ticket e9654505cfd
   21. Fix a problem in CSV import in the command-line shell where if the
       leftmost field of the first row in the CSV file was both zero bytes
       in size and unquoted no data would be imported.
   22. Fix a problem in FTS4 where the left-most column that contained the
       notindexed column name as a prefix was not indexed rather than the
       column whose name matched exactly.
   23. Fix the sqlite3_db_readonly() interface so that it returns true if
       the database is read-only due to the file format write version
       number being too large.
   24. SQLITE_SOURCE_ID: "2014-06-04 14:06:34
       b1ed4f2a34ba66c29b130f8d13e9092758019212"
   25. SHA1 for sqlite3.c: 7bc194957238c61b1a47f301270286be5bc5208c

  2014-04-03 (3.8.4.3)

    1. Add a one-character fix for a problem that might cause incorrect
       query results on a query that mixes DISTINCT, GROUP BY in a
       subquery, and ORDER BY. Ticket 98825a79ce14.
    2. SQLITE_SOURCE_ID: "2014-04-03 16:53:12
       a611fa96c4a848614efe899130359c9f6fb889c3"
    3. SHA1 for sqlite3.c: 310a1faeb9332a3cd8d1f53b4a2e055abf537bdc

  2014-03-26 (3.8.4.2)

    1. Fix a potential buffer overread that could result when trying to
       search a corrupt database file.
    2. SQLITE_SOURCE_ID: "2014-03-26 18:51:19
       02ea166372bdb2ef9d8dfbb05e78a97609673a8e"
    3. SHA1 for sqlite3.c: 4685ca86c2ea0649ed9f59a500013e90b3fe6d03

  2014-03-11 (3.8.4.1)

    1. Work around a C-preprocessor macro conflict that breaks the build
       for some configurations with Microsoft Visual Studio.
    2. When computing the cost of the skip-scan optimization, take into
       account the fact that multiple seeks are required.
    3. SQLITE_SOURCE_ID: "2014-03-11 15:27:36
       018d317b1257ce68a92908b05c9c7cf1494050d0"
    4. SHA1 for sqlite3.c: d5cd1535053a50aa8633725e3595740b33709ac5

  2014-03-10 (3.8.4)

    1. Code optimization and refactoring for improved performance.
    2. Add the ".clone" and ".save" commands to the command-line shell.
    3. Update the banner on the command-line shell to alert novice users
       when they are using an ephemeral in-memory database.
    4. Fix editline support in the command-line shell.
    5. Add support for coverage testing of VDBE programs using the
       SQLITE_TESTCTRL_VDBE_COVERAGE verb of sqlite3_test_control().
    6. Update the _FILE_OFFSET_BITS macro so that builds work again on
       QNX.
    7. Change the datatype of SrcList.nSrc from type u8 to type int to
       work around an issue in the C compiler on AIX.
    8. Get extension loading working on Cygwin.
    9. Bug fix: Fix the char() SQL function so that it returns an empty
       string rather than an "out of memory" error when called with zero
       arguments.
   10. Bug fix: DISTINCT now recognizes that a zeroblob and a blob of all
       0x00 bytes are the same thing. Ticket [fccbde530a]
   11. Bug fix: Compute the correct answer for queries that contain an IS
       NOT NULL term in the WHERE clause and also contain an OR term in
       the WHERE clause and are compiled with SQLITE_ENABLE_STAT4. Ticket
       [4c86b126f2]
   12. Bug fix: Make sure "rowid" columns are correctly resolved in joins
       between normal tables and WITHOUT ROWID tables. Ticket [c34d0557f7]
   13. Bug fix: Make sure the same temporary registers are not used in
       concurrent co-routines used to implement compound SELECT statements
       containing ORDER BY clauses, as such use can lead to incorrect
       answers. Ticket [8c63ff0eca]
   14. Bug fix: Ensure that "ORDER BY random()" clauses do not get
       optimized out. Ticket [65bdeb9739]
   15. Bug fix: Repair a name-resolution error that can occur in
       sub-select statements contained within a TRIGGER. Ticket
       [4ef7e3cfca]
   16. Bug fix: Fix column default values expressions of the form
       "DEFAULT(-(-9223372036854775808))" so that they work correctly,
       initializing the column to a floating point value approximately
       equal to +9223372036854775808.0.
   17. SQLITE_SOURCE_ID: "2014-03-10 12:20:37
       530a1ee7dc2435f80960ce4710a3c2d2bfaaccc5"
   18. SHA1 for sqlite3.c: b0c22e5f15f5ba2afd017ecd990ea507918afe1c

  2014-02-11 (3.8.3.1)

    1. Fix a bug (ticket 4c86b126f2) that causes rows to go missing on
       some queries with OR clauses and IS NOT NULL operators in the WHERE
       clause, when the SQLITE_ENABLE_STAT3 or SQLITE_ENABLE_STAT4
       compile-time options are used.
    2. Fix a harmless compiler warning that was causing problems for
       VS2013.
    3. SQLITE_SOURCE_ID: "2014-02-11 14:52:19
       ea3317a4803d71d88183b29f1d3086f46d68a00e"
    4. SHA1 for sqlite3.c: 990004ef2d0eec6a339e4caa562423897fe02bf0

  2014-02-03 (3.8.3)

    1. Added support for common table expressions and the WITH clause.
    2. Added the printf() SQL function.
    3. Added SQLITE_DETERMINISTIC as an optional bit in the 4th argument
       to the sqlite3_create_function() and related interfaces, providing
       applications with the ability to create new functions that can be
       factored out of inner loops when they have constant arguments.
    4. Add SQLITE_READONLY_DBMOVED error code, returned at the beginning
       of a transaction, to indicate that the underlying database file has
       been renamed or moved out from under SQLite.
    5. Allow arbitrary expressions, including function calls and
       subqueries, in the filename argument to ATTACH.
    6. Allow a VALUES clause to be used anywhere a SELECT statement is
       valid.
    7. Reseed the PRNG used by sqlite3_randomness(N,P) when invoked with
       N==0. Automatically reseed after a fork() on unix.
    8. Enhance the spellfix1 virtual table so that it can search
       efficiently by rowid.
    9. Performance enhancements.
   10. Improvements to the comments in the VDBE byte-code display when
       running EXPLAIN.
   11. Add the "%token_class" directive to Lemon parser generator and use
       it to simplify the grammar.
   12. Change the Lemon source code to avoid calling C-library functions
       that OpenBSD considers dangerous. (Ex: sprintf).
   13. Bug fix: In the command-line shell CSV import feature, do not end a
       field when an escaped double-quote occurs at the end of a CRLN
       line.
   14. SQLITE_SOURCE_ID: "2014-02-03 13:52:03
       e816dd924619db5f766de6df74ea2194f3e3b538"
   15. SHA1 for sqlite3.c: 98a07da78f71b0275e8d9c510486877adc31dbee

  2013-12-06 (3.8.2)

    1. Changed the defined behavior for the CAST expression when floating
       point values greater than +9223372036854775807 are cast into into
       integers so that the result is the largest possible integer,
       +9223372036854775807, instead of the smallest possible integer,
       -9223372036854775808. After this change, CAST(9223372036854775809.0
       as INT) yields +9223372036854775807 instead of
       -9223372036854775808. ← Potentially Incompatible Change!
    2. Added support for WITHOUT ROWID tables.
    3. Added the skip-scan optimization to the query planner.
    4. Extended the virtual table interface, and in particular the
       sqlite3_index_info object to allow a virtual table to report its
       estimate on the number of rows that will be returned by a query.
    5. Update the R-Tree extension to make use of the enhanced virtual
       table interface.
    6. Add the SQLITE_ENABLE_EXPLAIN_COMMENTS compile-time option.
    7. Enhanced the comments that are inserted into EXPLAIN output when
       the SQLITE_ENABLE_EXPLAIN_COMMENTS compile-time option is enabled.
    8. Performance enhancements in the VDBE, especially to the OP_Column
       opcode.
    9. Factor constant subexpressions in inner loops out to the
       initialization code in prepared statements.
   10. Enhanced the ".explain" output formatting of the command-line shell
       so that loops are indented to better show the structure of the
       program.
   11. Enhanced the ".timer" feature of the command-line shell so that it
       shows wall-clock time in addition to system and user times.
   12. SQLITE_SOURCE_ID: "2013-12-06 14:53:30
       27392118af4c38c5203a04b8013e1afdb1cebd0d"
   13. SHA1 for sqlite3.c: 6422c7d69866f5ea3db0968f67ee596e7114544e

  2013-10-17 (3.8.1)

    1. Added the unlikely() and likelihood() SQL functions to be used as
       hints to the query planner.
    2. Enhancements to the query planner:
         a. Take into account the fact WHERE clause terms that cannot be
            used with indices still probably reduce the number of output
            rows.
         b. Estimate the sizes of table and index rows and use the
            smallest applicable B-Tree for full scans and "count(*)"
            operations.
    3. Added the soft_heap_limit pragma.
    4. Added support for SQLITE_ENABLE_STAT4
    5. Added support for "sz=NNN" parameters at the end of
       sqlite_stat1.stat fields used to specify the average length in
       bytes for table and index rows.
    6. Avoid running foreign-key constraint checks on an UPDATE if none of
       the modified columns are associated with foreign keys.
    7. Added the SQLITE_MINIMUM_FILE_DESCRIPTOR compile-time option
    8. Added the win32-longpath VFS on windows, permitting filenames up to
       32K characters in length.
    9. The Date And Time Functions are enhanced so that the current time
       (ex: julianday('now')) is always the same for multiple function
       invocations within the same sqlite3_step() call.
   10. Add the "totype.c" extension, implementing the tointeger() and
       toreal() SQL functions.
   11. FTS4 queries are better able to make use of docid<$limit
       constraints to limit the amount of I/O required.
   12. Added the hidden fts4aux languageid column to the fts4aux virtual
       table.
   13. The VACUUM command packs the database about 1% tighter.
   14. The sqlite3_analyzer utility program is updated to provide better
       descriptions and to compute a more accurate estimate for
       "Non-sequential pages"
   15. Refactor the implementation of PRAGMA statements to improve parsing
       performance.
   16. The directory used to hold temporary files on unix can now be set
       using the SQLITE_TMPDIR environment variable, which takes
       precedence over the TMPDIR environment variable. The
       sqlite3_temp_directory global variable still has higher precedence
       than both environment variables, however.
   17. Added the PRAGMA stats statement.
   18. Bug fix: Return the correct answer for "SELECT count(*) FROM table"
       even if there is a partial index on the table. Ticket a5c8ed66ca.
   19. SQLITE_SOURCE_ID: "2013-10-17 12:57:35
       c78be6d786c19073b3a6730dfe3fb1be54f5657a"
   20. SHA1 for sqlite3.c: 0a54d76566728c2ba96292a49b138e4f69a7c391

  2013-09-03 (3.8.0.2)

    1. Fix a bug in the optimization that attempts to omit unused LEFT
       JOINs
    2. SQLITE_SOURCE_ID: "2013-09-03 17:11:13
       7dd4968f235d6e1ca9547cda9cf3bd570e1609ef"
    3. SHA1 for sqlite3.c: 6cf0c7b46975a87a0dc3fba69c229a7de61b0c21

  2013-08-29 (3.8.0.1)

    1. Fix an off-by-one error that caused quoted empty string at the end
       of a CRNL-terminated line of CSV input to be misread by the
       command-line shell.
    2. Fix a query planner bug involving a LEFT JOIN with a BETWEEN or
       LIKE/GLOB constraint and then another INNER JOIN to the right that
       involves an OR constraint.
    3. Fix a query planner bug that could result in a segfault when
       querying tables with a UNIQUE or PRIMARY KEY constraint with more
       than four columns.
    4. SQLITE_SOURCE_ID: "2013-08-29 17:35:01
       352362bc01660edfbda08179d60f09e2038a2f49"
    5. SHA1 for sqlite3.c: 99906bf63e6cef63d6f3d7f8526ac4a70e76559e

  2013-08-26 (3.8.0)

    1. Add support for partial indexes
    2. Cut-over to the next generation query planner for faster and better
       query plans.
    3. The EXPLAIN QUERY PLAN output no longer shows an estimate of the
       number of rows generated by each loop in a join.
    4. Added the FTS4 notindexed option, allowing non-indexed columns in
       an FTS4 table.
    5. Added the SQLITE_STMTSTATUS_VM_STEP option to
       sqlite3_stmt_status().
    6. Added the cache_spill pragma.
    7. Added the query_only pragma.
    8. Added the defer_foreign_keys pragma and the sqlite3_db_status(db,
       SQLITE_DBSTATUS_DEFERRED_FKS,...) C-language interface.
    9. Added the "percentile()" function as a loadable extension in the
       ext/misc subdirectory of the source tree.
   10. Added the SQLITE_ALLOW_URI_AUTHORITY compile-time option.
   11. Add the sqlite3_cancel_auto_extension(X) interface.
   12. A running SELECT statement that lacks a FROM clause (or any other
       statement that never reads or writes from any database file) will
       not prevent a read transaction from closing.
   13. Add the SQLITE_DEFAULT_AUTOMATIC_INDEX compile-time option. Setting
       this option to 0 disables automatic indices by default.
   14. Issue an SQLITE_WARNING_AUTOINDEX warning on the SQLITE_CONFIG_LOG
       whenever the query planner uses an automatic index.
   15. Added the SQLITE_FTS3_MAX_EXPR_DEPTH compile-time option.
   16. Added an optional 5th parameter defining the collating sequence to
       the next_char() extension SQL function.
   17. The SQLITE_BUSY_SNAPSHOT extended error code is returned in WAL
       mode when a read transaction cannot be upgraded to a write
       transaction because the read is on an older snapshot.
   18. Enhancements to the sqlite3_analyzer utility program to provide
       size information separately for each individual index of a table,
       in addition to the aggregate size.
   19. Allow read transactions to be freely opened and closed by SQL
       statements run from within the implementation of
       application-defined SQL functions if the function is called by a
       SELECT statement that does not access any database table.
   20. Disable the use of posix_fallocate() on all (unix) systems unless
       the HAVE_POSIX_FALLOCATE compile-time option is used.
   21. Update the ".import" command in the command-line shell to support
       multi-line fields and correct RFC-4180 quoting and to issue warning
       and/or error messages if the input text is not strictly RFC-4180
       compliant.
   22. Bug fix: In the unicode61 tokenizer of FTS4, treat all private code
       points as identifier symbols.
   23. Bug fix: Bare identifiers in ORDER BY clauses bind more tightly to
       output column names, but identifiers in expressions bind more
       tightly to input column names. Identifiers in GROUP BY clauses
       always prefer output column names, however.
   24. Bug fixes: Multiple problems in the legacy query optimizer were
       fixed by the move to NGQP.
   25. SQLITE_SOURCE_ID: "2013-08-26 04:50:08
       f64cd21e2e23ed7cff48f7dafa5e76adde9321c2"
   26. SHA1 for sqlite3.c: b7347f4b4c2a840e6ba12040093d606bd16ea21e

  2013-05-20 (3.7.17)

    1. Add support for memory-mapped I/O.
    2. Add the sqlite3_strglob() convenience interface.
    3. Assigned the integer at offset 68 in the database header as the
       Application ID for when SQLite is used as an application
       file-format. Added the PRAGMA application_id command to query and
       set the Application ID.
    4. Report rollback recovery in the error log as
       SQLITE_NOTICE_RECOVER_ROLLBACK. Change the error log code for WAL
       recover from SQLITE_OK to SQLITE_NOTICE_RECOVER_WAL.
    5. Report the risky uses of unlinked database files and database
       filename aliasing as SQLITE_WARNING messages in the error log.
    6. Added the SQLITE_TRACE_SIZE_LIMIT compile-time option.
    7. Increase the default value of SQLITE_MAX_SCHEMA_RETRY to 50 and
       make sure that it is honored in every place that a schema change
       might force a statement retry.
    8. Add a new test harness called "mptester" used to verify correct
       operation when multiple processes are using the same database file
       at the same time.
    9. Enhance the extension loading mechanism to be more flexible (while
       still maintaining backwards compatibility) in two ways:
         1. If the default entry point "sqlite3_extension_init" is not
            present in the loadable extension, also try an entry point
            "sqlite3_X_init" where "X" is based on the shared library
            filename. This allows every extension to have a different
            entry point, which allows them to be statically linked with no
            code changes.
         2. The shared library filename passed to sqlite3_load_extension()
            may omit the filename suffix, and an appropriate
            architecture-dependent suffix (".so", ".dylib", or ".dll")
            will be added automatically.
   10. Added many new loadable extensions to the source tree, including
       amatch, closure, fuzzer, ieee754, nextchar, regexp, spellfix, and
       wholenumber. See header comments on each extension source file for
       further information about what that extension does.
   11. Enhance FTS3 to avoid using excess stack space when there are a
       huge number of terms on the right-hand side of the MATCH operator.
       A side-effect of this change is that the MATCH operator can only
       accommodate 12 NEAR operators at a time.
   12. Enhance the fts4aux virtual table so that it can be a TEMP table.
   13. Added the fts3tokenize virtual table to the full-text search logic.
   14. Query planner enhancement: Use the transitive property of
       constraints to move constraints into the outer loops of a join
       whenever possible, thereby reducing the amount of work that needs
       to occur in inner loops.
   15. Discontinue the use of posix_fallocate() on unix, as it does not
       work on all filesystems.
   16. Improved tracing and debugging facilities in the Windows VFS.
   17. Bug fix: Fix a potential database corruption bug in shared cache
       mode when one database connection is closed while another is in the
       middle of a write transaction. Ticket e636a050b7
   18. Bug fix: Only consider AS names from the result set as candidates
       for resolving identifiers in the WHERE clause if there are no other
       matches. In the ORDER BY clause, AS names take priority over any
       column names. Ticket 2500cdb9be05
   19. Bug fix: Do not allow a virtual table to cancel the ORDER BY clause
       unless all outer loops are guaranteed to return no more than one
       row result. Ticket ba82a4a41eac1.
   20. Bug fix: Do not suppress the ORDER BY clause on a virtual table
       query if an IN constraint is used. Ticket f69b96e3076e.
   21. Bug fix: The command-line shell gives an exit code of 0 when
       terminated using the ".quit" command.
   22. Bug fix: Make sure PRAGMA statements appear in sqlite3_trace()
       output.
   23. Bug fix: When a compound query that uses an ORDER BY clause with a
       COLLATE operator, make sure that the sorting occurs according to
       the specified collation and that the comparisons associate with the
       compound query use the native collation. Ticket 6709574d2a8d8.
   24. Bug fix: Makes sure the authorizer callback gets a valid pointer to
       the string "ROWID" for the column-name parameter when doing an
       UPDATE that changes the rowid. Ticket 0eb70d77cb05bb2272
   25. Bug fix: Do not move WHERE clause terms inside OR expressions that
       are contained within an ON clause of a LEFT JOIN. Ticket f2369304e4
   26. Bug fix: Make sure an error is always reported when attempting to
       preform an operation that requires a collating sequence that is
       missing. Ticket 0fc59f908b
   27. SQLITE_SOURCE_ID: "2013-05-20 00:56:22
       118a3b35693b134d56ebd780123b7fd6f1497668"
   28. SHA1 for sqlite3.c: 246987605d0503c700a08b9ee99a6b5d67454aab

  2013-04-12 (3.7.16.2)

    1. Fix a bug (present since version 3.7.13) that could result in
       database corruption on windows if two or more processes try to
       access the same database file at the same time and immediately
       after third process crashed in the middle of committing to that
       same file. See ticket 7ff3120e4f for further information.
    2. SQLITE_SOURCE_ID: "2013-04-12 11:52:43
       cbea02d93865ce0e06789db95fd9168ebac970c7"
    3. SHA1 for sqlite3.c: d466b54789dff4fb0238b9232e74896deaefab94

  2013-03-29 (3.7.16.1)

    1. Fix for a bug in the ORDER BY optimizer that was introduced in
       version 3.7.15 which would sometimes optimize out the sorting step
       when in fact the sort was required. Ticket a179fe7465
    2. Fix a long-standing bug in the CAST expression that would recognize
       UTF16 characters as digits even if their most-significant-byte was
       not zero. Ticket 689137afb6da41.
    3. Fix a bug in the NEAR operator of FTS3 when applied to subfields.
       Ticket 38b1ae018f.
    4. Fix a long-standing bug in the storage engine that would (very
       rarely) cause a spurious report of an SQLITE_CORRUPT error but
       which was otherwise harmless. Ticket 6bfb98dfc0c.
    5. The SQLITE_OMIT_MERGE_SORT option has been removed. The merge
       sorter is now a required component of SQLite.
    6. Fixed lots of spelling errors in the source-code comments
    7. SQLITE_SOURCE_ID: "2013-03-29 13:44:34
       527231bc67285f01fb18d4451b28f61da3c4e39d"
    8. SHA1 for sqlite3.c: 7a91ceceac9bcf47ceb8219126276e5518f7ff5a

  2013-03-18 (3.7.16)

    1. Added the PRAGMA foreign_key_check command.
    2. Added new extended error codes for all SQLITE_CONSTRAINT errors
    3. Added the SQLITE_READONLY_ROLLBACK extended error code for when a
       database cannot be opened because it needs rollback recovery but is
       read-only.
    4. Added SQL functions unicode(A) and char(X1,...,XN).
    5. Performance improvements for PRAGMA incremental_vacuum, especially
       in cases where the number of free pages is greater than what will
       fit on a single trunk page of the freelist.
    6. Improved optimization of queries containing aggregate min() or
       max().
    7. Enhance virtual tables so that they can potentially use an index
       when the WHERE clause contains the IN operator.
    8. Allow indices to be used for sorting even if prior terms of the
       index are constrained by IN operators in the WHERE clause.
    9. Enhance the PRAGMA table_info command so that the "pk" column is an
       increasing integer to show the order of columns in the primary key.
   10. Enhance the query optimizer to exploit transitive join constraints.
   11. Performance improvements in the query optimizer.
   12. Allow the error message from PRAGMA integrity_check to be longer
       than 20000 bytes.
   13. Improved name resolution for deeply nested queries.
   14. Added the test_regexp.c module as a demonstration of how to
       implement the REGEXP operator.
   15. Improved error messages in the RTREE extension.
   16. Enhance the command-line shell so that a non-zero argument to the
       ".exit" command causes the shell to exit immediately without
       cleanly shutting down the database connection.
   17. Improved error messages for invalid boolean arguments to
       dot-commands in the command-line shell.
   18. Improved error messages for "foreign key mismatch" showing the
       names of the two tables involved.
   19. Remove all uses of umask() in the unix VFS.
   20. Added the PRAGMA vdbe_addoptrace and PRAGMA vdbe_debug commands.
   21. Change to use strncmp() or the equivalent instead of memcmp() when
       comparing non-zero-terminated strings.
   22. Update cygwin interfaces to omit deprecated API calls.
   23. Enhance the spellfix1 extension so that the edit distance cost
       table can be changed at runtime by inserting a string like
       'edit_cost_table=TABLE' into the "command" field.
   24. Bug fix: repair a long-standing problem that could cause incorrect
       query results in a 3-way or larger join that compared INTEGER
       fields against TEXT fields in two or more places. Ticket fc7bd6358f
   25. Bug fix: Issue an error message if the 16-bit reference counter on
       a view overflows due to an overly complex query.
   26. Bug fix: Avoid leaking memory on LIMIT and OFFSET clauses in deeply
       nested UNION ALL queries.
   27. Bug fix: Make sure the schema is up-to-date prior to running
       pragmas table_info, index_list, index_info, and foreign_key_list.
   28. SQLITE_SOURCE_ID: "2013-03-18 11:39:23
       66d5f2b76750f3520eb7a495f6247206758f5b90"
   29. SHA1 for sqlite3.c: 7308ab891ca1b2ebc596025cfe4dc36f1ee89cf6

  2013-01-09 (3.7.15.2)

    1. Fix a bug, introduced in version 3.7.15, that causes an ORDER BY
       clause to be optimized out of a three-way join when the ORDER BY is
       actually required. Ticket 598f5f7596b055
    2. SQLITE_SOURCE_ID: "2013-01-09 11:53:05
       c0e09560d26f0a6456be9dd3447f5311eb4f238f"
    3. SHA1 for sqlite3.c: 5741f47d1bc38aa0a8c38f09e60a5fe0031f272d

  2012-12-19 (3.7.15.1)

    1. Fix a bug, introduced in version 3.7.15, that causes a segfault if
       the AS name of a result column of a SELECT statement is used as a
       logical term in the WHERE clause. Ticket a7b7803e8d1e869.
    2. SQLITE_SOURCE_ID: "2012-12-19 20:39:10
       6b85b767d0ff7975146156a99ad673f2c1a23318"
    3. SHA1 for sqlite3.c: bbbaa68061e925bd4d7d18d7e1270935c5f7e39a

  2012-12-12 (3.7.15)

    1. Added the sqlite3_errstr() interface.
    2. Avoid invoking the sqlite3_trace() callback multiple times when a
       statement is automatically reprepared due to SQLITE_SCHEMA errors.
    3. Added support for Windows Phone 8 platforms
    4. Enhance IN operator processing to make use of indices with numeric
       affinities.
    5. Do full-table scans using covering indices when possible, under the
       theory that an index will be smaller and hence can be scanned with
       less I/O.
    6. Enhance the query optimizer so that ORDER BY clauses are more
       aggressively optimized, especially in joins where various terms of
       the ORDER BY clause come from separate tables of the join.
    7. Add the ability to implement FROM clause subqueries as coroutines
       rather that manifesting the subquery into a temporary table.
    8. Enhancements the command-line shell:
         a. Added the ".print" command
         b. Negative numbers in the ".width" command cause right-alignment
         c. Add the ".wheretrace" command when compiled with SQLITE_DEBUG
    9. Added the busy_timeout pragma.
   10. Added the instr() SQL function.
   11. Added the SQLITE_FCNTL_BUSYHANDLER file control, used to allow VFS
       implementations to get access to the busy handler callback.
   12. The xDelete method in the built-in VFSes now return
       SQLITE_IOERR_DELETE_NOENT if the file to be deleted does not exist.
   13. Enhanced support for QNX.
   14. Work around an optimizer bug in the MSVC compiler when targeting
       ARM.
   15. Bug fix: Avoid various concurrency problems in shared cache mode.
   16. Bug fix: Avoid a deadlock or crash if the backup API, shared cache,
       and the SQLite Encryption Extension are all used at once.
   17. Bug fix: SQL functions created using the TCL interface honor the
       "nullvalue" setting.
   18. Bug fix: Fix a 32-bit overflow problem on CREATE INDEX for
       databases larger than 16GB.
   19. Bug fix: Avoid segfault when using the COLLATE operator inside of a
       CHECK constraint or view in shared cache mode.
   20. SQLITE_SOURCE_ID: "2012-12-12 13:36:53
       cd0b37c52658bfdf992b1e3dc467bae1835a94ae"
   21. SHA1 for sqlite3.c: 2b413611f5e3e3b6ef5f618f2a9209cdf25cbcff"

  2012-10-04 (3.7.14.1)

    1. Fix a bug (ticket [d02e1406a58ea02d]]) that causes a segfault on a
       LEFT JOIN that includes an OR in the ON clause.
    2. Work around a bug in the optimizer in the VisualStudio-2012
       compiler that causes invalid code to be generated when compiling
       SQLite on ARM.
    3. Fix the TCL interface so that the "nullvalue" setting is honored
       for TCL implementations of SQL functions.
    4. SQLITE_SOURCE_ID: "2012-10-04 19:37:12
       091570e46d04e84b67228e0bdbcd6e1fb60c6bdb"
    5. SHA1 for sqlite3.c: 62aaecaacab3a4bf4a8fe4aec1cfdc1571fe9a44

  2012-09-03 (3.7.14)

    1. Drop built-in support for OS/2. If you need to upgrade an OS/2
       application to use this or a later version of SQLite, then add an
       application-defined VFS using the sqlite3_vfs_register() interface.
       The code removed in this release can serve as a baseline for the
       application-defined VFS.
    2. Ensure that floating point values are preserved exactly when
       reconstructing a database from the output of the ".dump" command of
       the command-line shell.
    3. Added the sqlite3_close_v2() interface.
    4. Updated the command-line shell so that it can be built using
       SQLITE_OMIT_FLOATING_POINT and SQLITE_OMIT_AUTOINIT.
    5. Improvements to the windows makefiles and build processes.
    6. Enhancements to PRAGMA integrity_check and PRAGMA quick_check so
       that they can optionally check just a single attached database
       instead of all attached databases.
    7. Enhancements to WAL mode processing that ensure that at least one
       valid read-mark is available at all times, so that read-only
       processes can always read the database.
    8. Performance enhancements in the sorter used by ORDER BY and CREATE
       INDEX.
    9. Added the SQLITE_DISABLE_FTS4_DEFERRED compile-time option.
   10. Better handling of aggregate queries where the aggregate functions
       are contained within subqueries.
   11. Enhance the query planner so that it will try to use a covering
       index on queries that make use of or optimization.
   12. SQLITE_SOURCE_ID: "2012-09-03 15:42:36
       c0d89d4a9752922f9e367362366efde4f1b06f2a"
   13. SHA1 for sqlite3.c: 5fdf596b29bb426001f28b488ff356ae14d5a5a6

  2012-06-11 (3.7.13)

    1. In-memory databases that are specified using URI filenames are
       allowed to use shared cache, so that the same in-memory database
       can be accessed from multiple database connections.
    2. Recognize and use the mode=memory query parameter in URI filenames.
    3. Avoid resetting the schema of shared cache connections when any one
       connection closes. Instead, wait for the last connection to close
       before resetting the schema.
    4. In the RTREE extension, when rounding 64-bit floating point numbers
       to 32-bit for storage, always round in a direction that causes the
       bounding box to get larger.
    5. Adjust the unix driver to avoid unnecessary calls to fchown().
    6. Add interfaces sqlite3_quota_ferror() and
       sqlite3_quota_file_available() to the test_quota.c module.
    7. The sqlite3_create_module() and sqlite3_create_module_v2()
       interfaces return SQLITE_MISUSE on any attempt to overload or
       replace a virtual table module. The destructor is always called in
       this case, in accordance with historical and current documentation.
    8. SQLITE_SOURCE_ID: "2012-06-11 02:05:22
       f5b5a13f7394dc143aa136f1d4faba6839eaa6dc"
    9. SHA1 for sqlite3.c: ff0a771d6252545740ba9685e312b0e3bb6a641b

  2012-05-22 (3.7.12.1)

    1. Fix a bug (ticket c2ad16f997) in the 3.7.12 release that can cause
       a segfault for certain obscure nested aggregate queries.
    2. Fix various other minor test script problems.
    3. SQLITE_SOURCE_ID: "2012-05-22 02:45:53
       6d326d44fd1d626aae0e8456e5fa2049f1ce0789"
    4. SHA1 for sqlite3.c: d494e8d81607f0515d4f386156fb0fd86d5ba7df

  2012-05-14 (3.7.12)

    1. Add the SQLITE_DBSTATUS_CACHE_WRITE option for sqlite3_db_status().
    2. Optimize the typeof() and length() SQL functions so that they avoid
       unnecessary reading of database content from disk.
    3. Add the FTS4 "merge" command, the FTS4 "automerge" command, and the
       FTS4 "integrity-check" command.
    4. Report the name of specific CHECK constraints that fail.
    5. In the command-line shell, use popen() instead of fopen() if the
       first character of the argument to the ".output" command is "|".
    6. Make use of OVERLAPPED in the windows VFS to avoid some system
       calls and thereby obtain a performance improvement.
    7. More aggressive optimization of the AND operator when one side or
       the other is always false.
    8. Improved performance of queries with many OR-connected terms in the
       WHERE clause that can all be indexed.
    9. Add the SQLITE_RTREE_INT_ONLY compile-time option to force the
       R*Tree Extension Module to use integer instead of floating point
       values for both storage and computation.
   10. Enhance the PRAGMA integrity_check command to use much less memory
       when processing multi-gigabyte databases.
   11. New interfaces added to the test_quota.c add-on module.
   12. Added the ".trace" dot-command to the command-line shell.
   13. Allow virtual table constructors to be invoked recursively.
   14. Improved optimization of ORDER BY clauses on compound queries.
   15. Improved optimization of aggregate subqueries contained within an
       aggregate query.
   16. Bug fix: Fix the RELEASE command so that it does not cancel pending
       queries. This repairs a problem introduced in 3.7.11.
   17. Bug fix: Do not discard the DISTINCT as superfluous unless a subset
       of the result set is subject to a UNIQUE constraint and it none of
       the columns in that subset can be NULL. Ticket 385a5b56b9.
   18. Bug fix: Do not optimize away an ORDER BY clause that has the same
       terms as a UNIQUE index unless those terms are also NOT NULL.
       Ticket 2a5629202f.
   19. SQLITE_SOURCE_ID: "2012-05-14 01:41:23
       8654aa9540fe9fd210899d83d17f3f407096c004"
   20. SHA1 for sqlite3.c: 57e2104a0f7b3f528e7f6b7a8e553e2357ccd2e1

  2012-03-20 (3.7.11)

    1. Enhance the INSERT syntax to allow multiple rows to be inserted via
       the VALUES clause.
    2. Enhance the CREATE VIRTUAL TABLE command to support the IF NOT
       EXISTS clause.
    3. Added the sqlite3_stricmp() interface as a counterpart to
       sqlite3_strnicmp().
    4. Added the sqlite3_db_readonly() interface.
    5. Added the SQLITE_FCNTL_PRAGMA file control, giving VFS
       implementations the ability to add new PRAGMA statements or to
       override built-in PRAGMAs.
    6. Queries of the form: "SELECT max(x), y FROM table" returns the
       value of y on the same row that contains the maximum x value.
    7. Added support for the FTS4 languageid option.
    8. Documented support for the FTS4 content option. This feature has
       actually been in the code since version 3.7.9 but is only now
       considered to be officially supported.
    9. Pending statements no longer block ROLLBACK. Instead, the pending
       statement will return SQLITE_ABORT upon next access after the
       ROLLBACK.
   10. Improvements to the handling of CSV inputs in the command-line
       shell
   11. Fix a bug introduced in version 3.7.10 that might cause a LEFT JOIN
       to be incorrectly converted into an INNER JOIN if the WHERE clause
       indexable terms connected by OR.
   12. SQLITE_SOURCE_ID: "2012-03-20 11:35:50
       00bb9c9ce4f465e6ac321ced2a9d0062dc364669"
   13. SHA1 for sqlite3.c: d460d7eda3a9dccd291aed2a9fda868b9b120a10

  2012-01-16 (3.7.10)

    1. The default schema format number is changed from 1 to 4. This means
       that, unless the PRAGMA legacy_file_format=ON statement is run,
       newly created database files will be unreadable by version of
       SQLite prior to 3.3.0 (2006-01-10). It also means that the
       descending indices are enabled by default.
    2. The sqlite3_pcache_methods structure and the SQLITE_CONFIG_PCACHE
       and SQLITE_CONFIG_GETPCACHE configuration parameters are
       deprecated. They are replaced by a new sqlite3_pcache_methods2
       structure and SQLITE_CONFIG_PCACHE2 and SQLITE_CONFIG_GETPCACHE2
       configuration parameters.
    3. Added the powersafe overwrite property to the VFS interface.
       Provide the SQLITE_IOCAP_POWERSAFE_OVERWRITE I/O capability, the
       SQLITE_POWERSAFE_OVERWRITE compile-time option, and the
       "psow=BOOLEAN" query parameter for URI filenames.
    4. Added the sqlite3_db_release_memory() interface and the
       shrink_memory pragma.
    5. Added the sqlite3_db_filename() interface.
    6. Added the sqlite3_stmt_busy() interface.
    7. Added the sqlite3_uri_boolean() and sqlite3_uri_int64() interfaces.
    8. If the argument to PRAGMA cache_size is negative N, that means to
       use approximately -1024*N bytes of memory for the page cache
       regardless of the page size.
    9. Enhanced the default memory allocator to make use of _msize() on
       windows, malloc_size() on Mac, and malloc_usable_size() on Linux.
   10. Enhanced the query planner to support index queries with range
       constraints on the rowid.
   11. Enhanced the query planner flattening logic to allow UNION ALL
       compounds to be promoted upwards to replace a simple wrapper SELECT
       even if the compounds are joins.
   12. Enhanced the query planner so that the xfer optimization can be
       used with INTEGER PRIMARY KEY ON CONFLICT as long as the
       destination table is initially empty.
   13. Enhanced the windows VFS so that all system calls can be overridden
       using the xSetSystemCall interface.
   14. Updated the "unix-dotfile" VFS to use locking directories with
       mkdir() and rmdir() instead of locking files with open() and
       unlink().
   15. Enhancements to the test_quota.c extension to support stdio-like
       interfaces with quotas.
   16. Change the unix VFS to be tolerant of read() system calls that
       return less then the full number of requested bytes.
   17. Change both unix and windows VFSes to report a sector size of 4096
       instead of the old default of 512.
   18. In the TCL Interface, add the -uri option to the "sqlite3" TCL
       command used for creating new database connection objects.
   19. Added the SQLITE_TESTCTRL_EXPLAIN_STMT test-control option with the
       SQLITE_ENABLE_TREE_EXPLAIN compile-time option to enable the
       command-line shell to display ASCII-art parse trees of SQL
       statements that it processes, for debugging and analysis.
   20. Bug fix: Add an additional xSync when restarting a WAL in order to
       prevent an exceedingly unlikely but theoretically possible database
       corruption following power-loss. Ticket ff5be73dee.
   21. Bug fix: Change the VDBE so that all registers are initialized to
       Invalid instead of NULL. Ticket 7bbfb7d442
   22. Bug fix: Fix problems that can result from 32-bit integer overflow.
       Ticket ac00f496b7e2
   23. SQLITE_SOURCE_ID: "2012-01-16 13:28:40
       ebd01a8deffb5024a5d7494eef800d2366d97204"
   24. SHA1 for sqlite3.c: 6497cbbaad47220bd41e2e4216c54706e7ae95d4

  2011-11-01 (3.7.9)

    1. If a search token (on the right-hand side of the MATCH operator) in
       FTS4 begins with "^" then that token must be the first in its field
       of the document. ** Potentially Incompatible Change **
    2. Added options SQLITE_DBSTATUS_CACHE_HIT and
       SQLITE_DBSTATUS_CACHE_MISS to the sqlite3_db_status() interface.
    3. Removed support for SQLITE_ENABLE_STAT2, replacing it with the much
       more capable SQLITE_ENABLE_STAT3 option.
    4. Enhancements to the sqlite3_analyzer utility program, including the
       --pageinfo and --stats options and support for multiplexed
       databases.
    5. Enhance the sqlite3_data_count() interface so that it can be used
       to determine if SQLITE_DONE has been seen on the prepared
       statement.
    6. Added the SQLITE_FCNTL_OVERWRITE file-control by which the SQLite
       core indicates to the VFS that the current transaction will
       overwrite the entire database file.
    7. Increase the default lookaside memory allocator allocation size
       from 100 to 128 bytes.
    8. Enhanced the query planner so that it can factor terms in and out
       of OR expressions in the WHERE clause in an effort to find better
       indices.
    9. Added the SQLITE_DIRECT_OVERFLOW_READ compile-time option, causing
       overflow pages to be read directly from the database file,
       bypassing the page cache.
   10. Remove limits on the magnitude of precision and width value in the
       format specifiers of the sqlite3_mprintf() family of string
       rendering routines.
   11. Fix a bug that prevent ALTER TABLE ... RENAME from working on some
       virtual tables in a database with a UTF16 encoding.
   12. Fix a bug in ASCII-to-float conversion that causes slow performance
       and incorrect results when converting numbers with ridiculously
       large exponents.
   13. Fix a bug that causes incorrect results in aggregate queries that
       use multiple aggregate functions whose arguments contain
       complicated expressions that differ only in the case of string
       literals contained within those expressions.
   14. Fix a bug that prevented the page_count and quick_check pragmas
       from working correctly if their names were capitalized.
   15. Fix a bug that caused VACUUM to fail if the count_changes pragma
       was engaged.
   16. Fix a bug in virtual table implementation that causes a crash if an
       FTS4 table is dropped inside a transaction and a SAVEPOINT occurs
       afterwards.
   17. SQLITE_SOURCE_ID: "2011-11-01 00:52:41
       c7c6050ef060877ebe77b41d959e9df13f8c9b5e"
   18. SHA1 for sqlite3.c: becd16877f4f9b281b91c97e106089497d71bb47

  2011-09-19 (3.7.8)

    1. Orders of magnitude performance improvement for CREATE INDEX on
       very large tables.
    2. Improved the windows VFS to better defend against interference from
       anti-virus software.
    3. Improved query plan optimization when the DISTINCT keyword is
       present.
    4. Allow more system calls to be overridden in the unix VFS - to
       provide better support for chromium sandboxes.
    5. Increase the default size of a lookahead cache line from 100 to 128
       bytes.
    6. Enhancements to the test_quota.c module so that it can track
       preexisting files.
    7. Bug fix: Virtual tables now handle IS NOT NULL constraints
       correctly.
    8. Bug fixes: Correctly handle nested correlated subqueries used with
       indices in a WHERE clause.
    9. SQLITE_SOURCE_ID: "2011-09-19 14:49:19
       3e0da808d2f5b4d12046e05980ca04578f581177"
   10. SHA1 for sqlite3.c: bfcd74a655636b592c5dba6d0d5729c0f8e3b4de

  2011-06-28 (3.7.7.1)

    1. Fix a bug causing PRAGMA case_sensitive_like statements compiled
       using sqlite3_prepare() to fail with an SQLITE_SCHEMA error.
    2. SQLITE_SOURCE_ID: "2011-06-28 17:39:05
       af0d91adf497f5f36ec3813f04235a6e195a605f"
    3. SHA1 for sqlite3.c: d47594b8a02f6cf58e91fb673e96cb1b397aace0

  2011-06-23 (3.7.7)

    1. Add support for URI filenames
    2. Add the sqlite3_vtab_config() interface in support of ON CONFLICT
       clauses with virtual tables.
    3. Add the xSavepoint, xRelease and xRollbackTo methods in virtual
       tables in support of SAVEPOINT for virtual tables.
    4. Update the built-in FTS3/FTS4 and RTREE virtual tables to support
       ON CONFLICT clauses and REPLACE.
    5. Avoid unnecessary reparsing of the database schema.
    6. Added support for the FTS4 prefix option and the FTS4 order option.
    7. Allow WAL-mode databases to be opened read-only as long as there is
       an existing read/write connection.
    8. Added support for short filenames.
    9. SQLITE_SOURCE_ID: "2011-06-23 19:49:22
       4374b7e83ea0a3fbc3691f9c0c936272862f32f2"
   10. SHA1 for sqlite3.c: 5bbe79e206ae5ffeeca760dbd0d66862228db551

  2011-05-19 (3.7.6.3)

    1. Fix a problem with WAL mode which could cause transactions to
       silently rollback if the cache_size is set very small (less than
       10) and SQLite comes under memory pressure.

  2011-04-17 (3.7.6.2)

    1. Fix the function prototype for the open(2) system call to agree
       with POSIX. Without this fix, pthreads does not work correctly on
       NetBSD.
    2. SQLITE_SOURCE_ID: "2011-04-17 17:25:17
       154ddbc17120be2915eb03edc52af1225eb7cb5e"
    3. SHA1 for sqlite3.c: 806577fd524dd5f3bfd8d4d27392ed2752bc9701

  2011-04-13 (3.7.6.1)

    1. Fix a bug in 3.7.6 that only appears if the SQLITE_FCNTL_SIZE_HINT
       file control is used with a build of SQLite that makes use of the
       HAVE_POSIX_FALLOCATE compile-time option and which has
       SQLITE_ENABLE_LOCKING_MODE turned off.
    2. SQLITE_SOURCE_ID: "2011-04-13 14:40:25
       a35e83eac7b185f4d363d7fa51677f2fdfa27695"
    3. SHA1 for sqlite3.c: b81bfa27d3e09caf3251475863b1ce6dd9f6ab66

  2011-04-12 (3.7.6)

    1. Added the sqlite3_wal_checkpoint_v2() interface and enhanced the
       wal_checkpoint pragma to support blocking checkpoints.
    2. Improvements to the query planner so that it makes better estimates
       of plan costs and hence does a better job of choosing the right
       plan, especially when SQLITE_ENABLE_STAT2 is used.
    3. Fix a bug which prevented deferred foreign key constraints from
       being enforced when sqlite3_finalize() was not called by one
       statement with a failed foreign key constraint prior to another
       statement with foreign key constraints running.
    4. Integer arithmetic operations that would have resulted in overflow
       are now performed using floating-point instead.
    5. Increased the version number on the VFS object to 3 and added new
       methods xSetSysCall, xGetSysCall, and xNextSysCall used for doing
       full-coverage testing.
    6. Increase the maximum value of SQLITE_MAX_ATTACHED from 30 to 62
       (though the default value remains at 10).
    7. Enhancements to FTS4:
         a. Added the fts4aux table
         b. Added support for compressed FTS4 content
    8. Enhance the ANALYZE command to support the name of an index as its
       argument, in order to analyze just that one index.
    9. Added the "unix-excl" built-in VFS on unix and unix-like platforms.
   10. SQLITE_SOURCE_ID: "2011-04-12 01:58:40
       f9d43fa363d54beab6f45db005abac0a7c0c47a7"
   11. SHA1 for sqlite3.c: f38df08547efae0ff4343da607b723f588bbd66b

  2011-02-01 (3.7.5)

    1. Added the sqlite3_vsnprintf() interface.
    2. Added the SQLITE_DBSTATUS_LOOKASIDE_HIT,
       SQLITE_DBSTATUS_LOOKASIDE_MISS_SIZE, and
       SQLITE_DBSTATUS_LOOKASIDE_MISS_FULL options for the
       sqlite3_db_status() interface.
    3. Added the SQLITE_OMIT_AUTORESET compile-time option.
    4. Added the SQLITE_DEFAULT_FOREIGN_KEYS compile-time option.
    5. Updates to sqlite3_stmt_readonly() so that its result is
       well-defined for all prepared statements and so that it works with
       VACUUM.
    6. Added the "-heap" option to the command-line shell
    7. Fix a bug involving frequent changes in and out of WAL mode and
       VACUUM that could (in theory) cause database corruption.
    8. Enhance the sqlite3_trace() mechanism so that nested SQL statements
       such as might be generated by virtual tables are shown but are
       shown in comments and without parameter expansion. This greatly
       improves tracing output when using the FTS3/4 and/or RTREE virtual
       tables.
    9. Change the xFileControl() methods on all built-in VFSes to return
       SQLITE_NOTFOUND instead of SQLITE_ERROR for an unrecognized
       operation code.
   10. The SQLite core invokes the SQLITE_FCNTL_SYNC_OMITTED file control
       to the VFS in place of a call to xSync if the database has PRAGMA
       synchronous set to OFF.

  2010-12-07 (3.7.4)

    1. Added the sqlite3_blob_reopen() interface to allow an existing
       sqlite3_blob object to be rebound to a new row.
    2. Use the new sqlite3_blob_reopen() interface to improve the
       performance of FTS.
    3. VFSes that do not support shared memory are allowed to access WAL
       databases if PRAGMA locking_mode is set to EXCLUSIVE.
    4. Enhancements to EXPLAIN QUERY PLAN.
    5. Added the sqlite3_stmt_readonly() interface.
    6. Added PRAGMA checkpoint_fullfsync.
    7. Added the SQLITE_FCNTL_FILE_POINTER option to
       sqlite3_file_control().
    8. Added support for FTS4 and enhancements to the FTS matchinfo()
       function.
    9. Added the test_superlock.c module which provides example code for
       obtaining an exclusive lock to a rollback or WAL database.
   10. Added the test_multiplex.c module which provides an example VFS
       that provides multiplexing (sharding) of a DB, splitting it over
       multiple files of fixed size.
   11. A very obscure bug associated with the or optimization was fixed.

  2010-10-08 (3.7.3)

    1. Added the sqlite3_create_function_v2() interface that includes a
       destructor callback.
    2. Added support for custom r-tree queries using application-supplied
       callback routines to define the boundary of the query region.
    3. The default page cache strives more diligently to avoid using
       memory beyond what is allocated to it by SQLITE_CONFIG_PAGECACHE.
       Or if using page cache is allocating from the heap, it strives to
       avoid going over the sqlite3_soft_heap_limit64(), even if
       SQLITE_ENABLE_MEMORY_MANAGEMENT is not set.
    4. Added the sqlite3_soft_heap_limit64() interface as a replacement
       for sqlite3_soft_heap_limit().
    5. The ANALYZE command now gathers statistics on tables even if they
       have no indices.
    6. Tweaks to the query planner to help it do a better job of finding
       the most efficient query plan for each query.
    7. Enhanced the internal text-to-numeric conversion routines so that
       they work with UTF8 or UTF16, thereby avoiding some UTF16-to-UTF8
       text conversions.
    8. Fix a problem that was causing excess memory usage with large WAL
       transactions in win32 systems.
    9. The interface between the VDBE and B-Tree layer is enhanced such
       that the VDBE provides hints to the B-Tree layer letting the B-Tree
       layer know when it is safe to use hashing instead of B-Trees for
       transient tables.
   10. Miscellaneous documentation enhancements.

  2010-08-24 (3.7.2)

    1. Fix an old and very obscure bug that can lead to corruption of the
       database free-page list when incremental_vacuum is used.

  2010-08-23 (3.7.1)

    1. Added new commands SQLITE_DBSTATUS_SCHEMA_USED and
       SQLITE_DBSTATUS_STMT_USED to the sqlite3_db_status() interface, in
       order to report out the amount of memory used to hold the schema
       and prepared statements of a connection.
    2. Increase the maximum size of a database pages from 32KiB to 64KiB.
    3. Use the LIKE optimization even if the right-hand side string
       contains no wildcards.
    4. Added the SQLITE_FCNTL_CHUNK_SIZE verb to the
       sqlite3_file_control() interface for both unix and windows, to
       cause database files to grow in large chunks in order to reduce
       disk fragmentation.
    5. Fixed a bug in the query planner that caused performance
       regressions relative to 3.6.23.1 on some complex joins.
    6. Fixed a typo in the OS/2 backend.
    7. Refactored the pager module.
    8. The SQLITE_MAX_PAGE_SIZE compile-time option is now silently
       ignored. The maximum page size is hard-coded at 65536 bytes.

  2010-08-04 (3.7.0.1)

    1. Fix a potential database corruption bug that can occur if version
       3.7.0 and version 3.6.23.1 alternately write to the same database
       file. Ticket [51ae9cad317a1]
    2. Fix a performance regression related to the query planner
       enhancements of version 3.7.0.

  2010-07-21 (3.7.0)

    1. Added support for write-ahead logging.
    2. Query planner enhancement - automatic transient indices are created
       when doing so reduces the estimated query time.
    3. Query planner enhancement - the ORDER BY becomes a no-op if the
       query also contains a GROUP BY clause that forces the correct
       output order.
    4. Add the SQLITE_DBSTATUS_CACHE_USED verb for sqlite3_db_status().
    5. The logical database size is now stored in the database header so
       that bytes can be appended to the end of the database file without
       corrupting it and so that SQLite will work correctly on systems
       that lack support for ftruncate().

  2010-03-26 (3.6.23.1)

    1. Fix a bug in the offsets() function of FTS3
    2. Fix a missing "sync" that when omitted could lead to database
       corruption if a power failure or OS crash occurred just as a
       ROLLBACK operation was finishing.

  2010-03-09 (3.6.23)

    1. Added the secure_delete pragma.
    2. Added the sqlite3_compileoption_used() and
       sqlite3_compileoption_get() interfaces as well as the
       compile_options pragma and the sqlite_compileoption_used() and
       sqlite_compileoption_get() SQL functions.
    3. Added the sqlite3_log() interface together with the
       SQLITE_CONFIG_LOG verb to sqlite3_config(). The ".log" command is
       added to the Command Line Interface.
    4. Improvements to FTS3.
    5. Improvements and bug-fixes in support for
       SQLITE_OMIT_FLOATING_POINT.
    6. The integrity_check pragma is enhanced to detect out-of-order
       rowids.
    7. The ".genfkey" operator has been removed from the Command Line
       Interface.
    8. Updates to the co-hosted Lemon LALR(1) parser generator. (These
       updates did not affect SQLite.)
    9. Various minor bug fixes and performance enhancements.

  2010-01-06 (3.6.22)

    1. Fix bugs that can (rarely) lead to incorrect query results when the
       CAST or OR operators are used in the WHERE clause of a query.
    2. Continuing enhancements and improvements to FTS3.
    3. Other miscellaneous bug fixes.

  2009-12-07 (3.6.21)

    1. The SQL output resulting from sqlite3_trace() is now modified to
       include the values of bound parameters.
    2. Performance optimizations targeting a specific use case from a
       single high-profile user of SQLite. A 12% reduction in the number
       of CPU operations is achieved (as measured by Valgrind). Actual
       performance improvements in practice may vary depending on
       workload. Changes include:
         a. The ifnull() and coalesce() SQL functions are now implemented
            using in-line VDBE code rather than calling external
            functions, so that unused arguments need never be evaluated.
         b. The substr() SQL function does not bother to measure the
            length its entire input string if it is only computing a
            prefix
         c. Unnecessary OP_IsNull, OP_Affinity, and OP_MustBeInt VDBE
            opcodes are suppressed
         d. Various code refactorizations for performance
    3. The FTS3 extension has undergone a major rework and cleanup. New
       FTS3 documentation is now available.
    4. The SQLITE_SECURE_DELETE compile-time option fixed to make sure
       that content is deleted even when the truncate optimization
       applies.
    5. Improvements to "dot-command" handling in the Command Line
       Interface.
    6. Other minor bug fixes and documentation enhancements.

  2009-11-04 (3.6.20)

    1. Optimizer enhancement: prepared statements are automatically
       re-compiled when a binding on the RHS of a LIKE operator changes or
       when any range constraint changes under SQLITE_ENABLE_STAT2.
    2. Various minor bug fixes and documentation enhancements.

  2009-10-30 (3.6.16.1)

    1. A small patch to version 3.6.16 to fix the OP_If bug.

  2009-10-14 (3.6.19)

    1. Added support for foreign key constraints. Foreign key constraints
       are disabled by default. Use the foreign_keys pragma to turn them
       on.
    2. Generalized the IS and IS NOT operators to take arbitrary
       expressions on their right-hand side.
    3. The TCL Interface has been enhanced to use the Non-Recursive Engine
       (NRE) interface to the TCL interpreter when linked against TCL 8.6
       or later.
    4. Fix a bug introduced in 3.6.18 that can lead to a segfault when an
       attempt is made to write on a read-only database.

  2009-09-11 (3.6.18)

    1. Versioning of the SQLite source code has transitioned from CVS to
       Fossil.
    2. Query planner enhancements.
    3. The SQLITE_ENABLE_STAT2 compile-time option causes the ANALYZE
       command to collect a small histogram of each index, to help SQLite
       better select among competing range query indices.
    4. Recursive triggers can be enabled using the PRAGMA
       recursive_triggers statement.
    5. Delete triggers fire when rows are removed due to a REPLACE
       conflict resolution. This feature is only enabled when recursive
       triggers are enabled.
    6. Added the SQLITE_OPEN_SHAREDCACHE and SQLITE_OPEN_PRIVATECACHE
       flags for sqlite3_open_v2() used to override the global shared
       cache mode settings for individual database connections.
    7. Added improved version identification features: C-Preprocessor
       macro SQLITE_SOURCE_ID, C/C++ interface sqlite3_sourceid(), and SQL
       function sqlite_source_id().
    8. Obscure bug fix on triggers ([efc02f9779]).

  2009-08-10 (3.6.17)

    1. Expose the sqlite3_strnicmp() interface for use by extensions and
       applications.
    2. Remove the restriction on virtual tables and shared cache mode.
       Virtual tables and shared cache can now be used at the same time.
    3. Many code simplifications and obscure bug fixes in support of
       providing 100% branch test coverage.

  2009-06-27 (3.6.16)

    1. Fix a bug (ticket #3929) that occasionally causes INSERT or UPDATE
       operations to fail on an indexed table that has a self-modifying
       trigger.
    2. Other minor bug fixes and performance optimizations.

  2009-06-15 (3.6.15)

    1. Refactor the internal representation of SQL expressions so that
       they use less memory on embedded platforms.
    2. Reduce the amount of stack space used
    3. Fix an 64-bit alignment bug on HP/UX and Sparc
    4. The sqlite3_create_function() family of interfaces now return
       SQLITE_MISUSE instead of SQLITE_ERROR when passed invalid parameter
       combinations.
    5. When new tables are created using CREATE TABLE ... AS SELECT ...
       the datatype of the columns is the simplified SQLite datatype
       (TEXT, INT, REAL, NUMERIC, or BLOB) instead of a copy of the
       original datatype from the source table.
    6. Resolve race conditions when checking for a hot rollback journal.
    7. The sqlite3_shutdown() interface frees all mutexes under windows.
    8. Enhanced robustness against corrupt database files
    9. Continuing improvements to the test suite and fixes to obscure bugs
       and inconsistencies that the test suite improvements are
       uncovering.

  2009-05-25 (3.6.14.2)

    1. Fix a code generator bug introduced in version 3.6.14. This bug can
       cause incorrect query results under obscure circumstances. Ticket
       #3879.

  2009-05-19 (3.6.14.1)

    1. Fix a bug in group_concat(), ticket #3841
    2. Fix a performance bug in the pager cache, ticket #3844
    3. Fix a bug in the sqlite3_backup implementation that can lead to a
       corrupt backup database. Ticket #3858.

  2009-05-07 (3.6.14)

    1. Added the optional asynchronous VFS module.
    2. Enhanced the query optimizer so that virtual tables are able to
       make use of OR and IN operators in the WHERE clause.
    3. Speed improvements in the btree and pager layers.
    4. Added the SQLITE_HAVE_ISNAN compile-time option which will cause
       the isnan() function from the standard math library to be used
       instead of SQLite's own home-brew NaN checker.
    5. Countless minor bug fixes, documentation improvements, new and
       improved test cases, and code simplifications and cleanups.

  2009-04-13 (3.6.13)

    1. Fix a bug in version 3.6.12 that causes a segfault when running a
       count(*) on the sqlite_master table of an empty database. Ticket
       #3774.
    2. Fix a bug in version 3.6.12 that causes a segfault that when
       inserting into a table using a DEFAULT value where there is a
       function as part of the DEFAULT value expression. Ticket #3791.
    3. Fix data structure alignment issues on Sparc. Ticket #3777.
    4. Other minor bug fixes.

  2009-03-31 (3.6.12)

    1. Fixed a bug that caused database corruption when an
       incremental_vacuum is rolled back in an in-memory database. Ticket
       #3761.
    2. Added the sqlite3_unlock_notify() interface.
    3. Added the reverse_unordered_selects pragma.
    4. The default page size on windows is automatically adjusted to match
       the capabilities of the underlying filesystem.
    5. Add the new ".genfkey" command in the CLI for generating triggers
       to implement foreign key constraints.
    6. Performance improvements for "count(*)" queries.
    7. Reduce the amount of heap memory used, especially by TRIGGERs.
    8.

  2009-02-18 (3.6.11)

    1. Added the hot-backup interface.
    2. Added new commands ".backup" and ".restore" to the CLI.
    3. Added new methods backup and restore to the TCL interface.
    4. Improvements to the syntax bubble diagrams
    5. Various minor bug fixes

  2009-01-15 (3.6.10)

    1. Fix a cache coherency problem that could lead to database
       corruption. Ticket #3584.

  2009-01-14 (3.6.9)

    1. Fix two bugs, which when combined might result in incorrect query
       results. Both bugs were harmless by themselves; only when they team
       up do they cause problems. Ticket #3581.

  2009-01-12 (3.6.8)

    1. Added support for nested transactions
    2. Enhanced the query optimizer so that it is able to use multiple
       indices to efficiently process OR-connected constraints in a WHERE
       clause.
    3. Added support for parentheses in FTS3 query patterns using the
       SQLITE_ENABLE_FTS3_PARENTHESIS compile-time option.

  2008-12-16 (3.6.7)

    1. Reorganize the Unix interface in os_unix.c
    2. Added support for "Proxy Locking" on Mac OS X.
    3. Changed the prototype of the sqlite3_auto_extension() interface in
       a way that is backwards compatible but which might cause warnings
       in new builds of applications that use that interface.
    4. Changed the signature of the xDlSym method of the sqlite3_vfs
       object in a way that is backwards compatible but which might cause
       compiler warnings.
    5. Added superfluous casts and variable initializations in order to
       suppress nuisance compiler warnings.
    6. Fixes for various minor bugs.

  2008-11-26 (3.6.6.2)

    1. Fix a bug in the b-tree delete algorithm that seems like it might
       be able to cause database corruption. The bug was first introduced
       in version 3.6.6 by check-in [5899] on 2008-11-13.
    2. Fix a memory leak that can occur following a disk I/O error.

  2008-11-22 (3.6.6.1)

    1. Fix a bug in the page cache that can lead database corruption
       following a rollback. This bug was first introduced in version
       3.6.4.
    2. Two other very minor bug fixes

  2008-11-19 (3.6.6)

    1. Fix a #define that prevented memsys5 from compiling
    2. Fix a problem in the virtual table commit mechanism that was
       causing a crash in FTS3. Ticket #3497.
    3. Add the application-defined page cache
    4. Added built-in support for VxWorks

  2008-11-12 (3.6.5)

    1. Add the MEMORY option to the journal_mode pragma.
    2. Added the sqlite3_db_mutex() interface.
    3. Added the SQLITE_OMIT_TRUNCATE_OPTIMIZATION compile-time option.
    4. Fixed the truncate optimization so that sqlite3_changes() and
       sqlite3_total_changes() interfaces and the count_changes pragma
       return the correct values.
    5. Added the sqlite3_extended_errcode() interface.
    6. The COMMIT command now succeeds even if there are pending queries.
       It returns SQLITE_BUSY if there are pending incremental BLOB I/O
       requests.
    7. The error code is changed to SQLITE_BUSY (instead of SQLITE_ERROR)
       when an attempt is made to ROLLBACK while one or more queries are
       still pending.
    8. Drop all support for the experimental memory allocators memsys4 and
       memsys6.
    9. Added the SQLITE_ZERO_MALLOC compile-time option.

  2008-10-15 (3.6.4)

    1. Add option support for LIMIT and ORDER BY clauses on DELETE and
       UPDATE statements. Only works if SQLite is compiled with
       SQLITE_ENABLE_UPDATE_DELETE_LIMIT.
    2. Added the sqlite3_stmt_status() interface for performance
       monitoring.
    3. Add the INDEXED BY clause.
    4. The LOCKING_STYLE extension is now enabled by default on Mac OS X
    5. Added the TRUNCATE option to PRAGMA journal_mode
    6. Performance enhancements to tree balancing logic in the B-Tree
       layer.
    7. Added the source code and documentation for the genfkey program for
       automatically generating triggers to enforce foreign key
       constraints.
    8. Added the SQLITE_OMIT_TRUNCATE_OPTIMIZATION compile-time option.
    9. The SQL language documentation is converted to use syntax diagrams
       instead of BNF.
   10. Other minor bug fixes

  2008-09-22 (3.6.3)

    1. Fix for a bug in the SELECT DISTINCT logic that was introduced by
       the prior version.
    2. Other minor bug fixes

  2008-08-30 (3.6.2)

    1. Split the pager subsystem into separate pager and pcache
       subsystems.
    2. Factor out identifier resolution procedures into separate files.
    3. Bug fixes

  2008-08-06 (3.6.1)

    1. Added the lookaside memory allocator for a speed improvement in
       excess of 15% on some workloads. (Your mileage may vary.)
    2. Added the SQLITE_CONFIG_LOOKASIDE verb to sqlite3_config() to
       control the default lookaside configuration.
    3. Added verbs SQLITE_STATUS_PAGECACHE_SIZE and
       SQLITE_STATUS_SCRATCH_SIZE to the sqlite3_status() interface.
    4. Modified SQLITE_CONFIG_PAGECACHE and SQLITE_CONFIG_SCRATCH to
       remove the "+4" magic number in the buffer size computation.
    5. Added the sqlite3_db_config() and sqlite3_db_status() interfaces
       for controlling and monitoring the lookaside allocator separately
       on each database connection.
    6. Numerous other performance enhancements
    7. Miscellaneous minor bug fixes

  2008-07-16 (3.6.0 beta)

    1. Modifications to the virtual file system interface to support a
       wider range of embedded systems. See 35to36.html for additional
       information. *** Potentially incompatible change ***
    2. All C-preprocessor macros used to control compile-time options now
       begin with the prefix "SQLITE_". This may require changes to
       applications that compile SQLite using their own makefiles and with
       custom compile-time options, hence we mark this as a ***
       Potentially incompatible change ***
    3. The SQLITE_MUTEX_APPDEF compile-time option is no longer supported.
       Alternative mutex implementations can now be added at run-time
       using the sqlite3_config() interface with the SQLITE_CONFIG_MUTEX
       verb. *** Potentially incompatible change ***
    4. The handling of IN and NOT IN operators that contain a NULL on
       their right-hand side expression is brought into compliance with
       the SQL standard and with other SQL database engines. This is a bug
       fix, but as it has the potential to break legacy applications that
       depend on the older buggy behavior, we mark that as a ***
       Potentially incompatible change ***
    5. The result column names generated for compound subqueries have been
       simplified to show only the name of the column of the original
       table and omit the table name. This makes SQLite operate more like
       other SQL database engines.
    6. Added the sqlite3_config() interface for doing run-time
       configuration of the entire SQLite library.
    7. Added the sqlite3_status() interface used for querying run-time
       status information about the overall SQLite library and its
       subsystems.
    8. Added the sqlite3_initialize() and sqlite3_shutdown() interfaces.
    9. The SQLITE_OPEN_NOMUTEX option was added to sqlite3_open_v2().
   10. Added the PRAGMA page_count command.
   11. Added the sqlite3_next_stmt() interface.
   12. Added a new R*Tree virtual table

  2008-05-14 (3.5.9)

    1. Added experimental support for the journal_mode PRAGMA and
       persistent journal.
    2. Journal mode PERSIST is the default behavior in exclusive locking
       mode.
    3. Fix a performance regression on LEFT JOIN (see ticket #3015) that
       was mistakenly introduced in version 3.5.8.
    4. Performance enhancement: Reengineer the internal routines used to
       interpret and render variable-length integers.
    5. Fix a buffer-overrun problem in sqlite3_mprintf() which occurs when
       a string without a zero-terminator is passed to "%.*s".
    6. Always convert IEEE floating point NaN values into NULL during
       processing. (Ticket #3060)
    7. Make sure that when a connection blocks on a RESERVED lock that it
       is able to continue after the lock is released. (Ticket #3093)
    8. The "configure" scripts should now automatically configure Unix
       systems for large file support. Improved error messages for when
       large files are encountered and large file support is disabled.
    9. Avoid cache pages leaks following disk-full or I/O errors
   10. And, many more minor bug fixes and performance enhancements....

  2008-04-16 (3.5.8)

    1. Expose SQLite's internal pseudo-random number generator (PRNG) via
       the sqlite3_randomness() interface
    2. New interface sqlite3_context_db_handle() that returns the database
       connection handle that has invoked an application-defined SQL
       function.
    3. New interface sqlite3_limit() allows size and length limits to be
       set on a per-connection basis and at run-time.
    4. Improved crash-robustness: write the database page size into the
       rollback journal header.
    5. Allow the VACUUM command to change the page size of a database
       file.
    6. The xAccess() method of the VFS is allowed to return -1 to signal a
       memory allocation error.
    7. Performance improvement: The OP_IdxDelete opcode uses unpacked
       records, obviating the need for one OP_MakeRecord opcode call for
       each index record deleted.
    8. Performance improvement: Constant subexpressions are factored out
       of loops.
    9. Performance improvement: Results of OP_Column are reused rather
       than issuing multiple OP_Column opcodes.
   10. Fix a bug in the RTRIM collating sequence.
   11. Fix a bug in the SQLITE_SECURE_DELETE option that was causing
       Firefox crashes. Make arrangements to always test
       SQLITE_SECURE_DELETE prior to each release.
   12. Other miscellaneous performance enhancements.
   13. Other miscellaneous minor bug fixes.

  2008-03-17 (3.5.7)

    1. Fix a bug (ticket #2927) in the register allocation for compound
       selects - introduced by the new VM code in version 3.5.5.
    2. ALTER TABLE uses double-quotes instead of single-quotes for quoting
       filenames.
    3. Use the WHERE clause to reduce the size of a materialized VIEW in
       an UPDATE or DELETE statement. (Optimization)
    4. Do not apply the flattening optimization if the outer query is an
       aggregate and the inner query contains ORDER BY. (Ticket #2943)
    5. Additional OS/2 updates
    6. Added an experimental power-of-two, first-fit memory allocator.
    7. Remove all instances of sprintf() from the code
    8. Accept "Z" as the zulu timezone at the end of date strings
    9. Fix a bug in the LIKE optimizer that occurs when the last character
       before the first wildcard is an upper-case "Z"
   10. Added the "bitvec" object for keeping track of which pages have
       been journalled. Improves speed and reduces memory consumption,
       especially for large database files.
   11. Get the SQLITE_ENABLE_LOCKING_STYLE macro working again on Mac OS
       X.
   12. Store the statement journal in the temporary file directory instead
       of collocated with the database file.
   13. Many improvements and cleanups to the configure script

  2008-02-06 (3.5.6)

    1. Fix a bug (ticket #2913) that prevented virtual tables from working
       in a LEFT JOIN. The problem was introduced into shortly before the
       3.5.5 release.
    2. Bring the OS/2 porting layer up-to-date.
    3. Add the new sqlite3_result_error_code() API and use it in the
       implementation of ATTACH so that proper error codes are returned
       when an ATTACH fails.

  2008-01-31 (3.5.5)

    1. Convert the underlying virtual machine to be a register-based
       machine rather than a stack-based machine. The only user-visible
       change is in the output of EXPLAIN.
    2. Add the build-in RTRIM collating sequence.

  2007-12-14 (3.5.4)

    1. Fix a critical bug in UPDATE or DELETE that occurs when an OR
       REPLACE clause or a trigger causes rows in the same table to be
       deleted as side effects. (See ticket #2832.) The most likely result
       of this bug is a segmentation fault, though database corruption is
       a possibility.
    2. Bring the processing of ORDER BY into compliance with the SQL
       standard for case where a result alias and a table column name are
       in conflict. Correct behavior is to prefer the result alias. Older
       versions of SQLite incorrectly picked the table column. (See ticket
       #2822.)
    3. The VACUUM command preserves the setting of the legacy_file_format
       pragma. (Ticket #2804.)
    4. Productize and officially support the group_concat() SQL function.
    5. Better optimization of some IN operator expressions.
    6. Add the ability to change the auto_vacuum status of a database by
       setting the auto_vaccum pragma and VACUUMing the database.
    7. Prefix search in FTS3 is much more efficient.
    8. Relax the SQL statement length restriction in the CLI so that the
       ".dump" output of databases with very large BLOBs and strings can
       be played back to recreate the database.
    9. Other small bug fixes and optimizations.

  2007-11-27 (3.5.3)

    1. Move website and documentation files out of the source tree into a
       separate CM system.
    2. Fix a long-standing bug in INSERT INTO ... SELECT ... statements
       where the SELECT is compound.
    3. Fix a long-standing bug in RAISE(IGNORE) as used in BEFORE
       triggers.
    4. Fixed the operator precedence for the ~ operator.
    5. On Win32, do not return an error when attempting to delete a file
       that does not exist.
    6. Allow collating sequence names to be quoted.
    7. Modify the TCL interface to use sqlite3_prepare_v2().
    8. Fix multiple bugs that can occur following a malloc() failure.
    9. sqlite3_step() returns SQLITE_MISUSE instead of crashing when
       called with a NULL parameter.
   10. FTS3 now uses the SQLite memory allocator exclusively. The FTS3
       amalgamation can now be appended to the SQLite amalgamation to
       generate a super-amalgamation containing both.
   11. The DISTINCT keyword now will sometimes use an INDEX if an
       appropriate index is available and the optimizer thinks its use
       might be advantageous.

  2007-11-05 (3.5.2)

    1. Dropped support for the SQLITE_OMIT_MEMORY_ALLOCATION compile-time
       option.
    2. Always open files using FILE_FLAG_RANDOM_ACCESS under Windows.
    3. The 3rd parameter of the built-in SUBSTR() function is now
       optional.
    4. Bug fix: do not invoke the authorizer when reparsing the schema
       after a schema change.
    5. Added the experimental malloc-free memory allocator in mem3.c.
    6. Virtual machine stores 64-bit integer and floating point constants
       in binary instead of text for a performance boost.
    7. Fix a race condition in test_async.c.
    8. Added the ".timer" command to the CLI

  2007-10-04 (3.5.1)

    1. Nota Bene: We are not using terms "alpha" or "beta" on this release
       because the code is stable and because if we use those terms,
       nobody will upgrade. However, we still reserve the right to make
       incompatible changes to the new VFS interface in future releases.
    2. Fix a bug in the handling of SQLITE_FULL errors that could lead to
       database corruption. Ticket #2686.
    3. The test_async.c drive now does full file locking and works
       correctly when used simultaneously by multiple processes on the
       same database.
    4. The CLI ignores whitespace (including comments) at the end of lines
    5. Make sure the query optimizer checks dependencies on all terms of a
       compound SELECT statement. Ticket #2640.
    6. Add demonstration code showing how to build a VFS for a raw mass
       storage without a filesystem.
    7. Added an output buffer size parameter to the xGetTempname() method
       of the VFS layer.
    8. Sticky SQLITE_FULL or SQLITE_IOERR errors in the pager are reset
       when a new transaction is started.

  2007-09-04 (3.5.0) alpha

    1. Redesign the OS interface layer. See 34to35.html for details. ***
       Potentially incompatible change ***
    2. The sqlite3_release_memory(), sqlite3_soft_heap_limit(), and
       sqlite3_enable_shared_cache() interfaces now work cross all threads
       in the process, not just the single thread in which they are
       invoked. *** Potentially incompatible change ***
    3. Added the sqlite3_open_v2() interface.
    4. Reimplemented the memory allocation subsystem and made it
       replaceable at compile-time.
    5. Created a new mutex subsystem and made it replicable at
       compile-time.
    6. The same database connection may now be used simultaneously by
       separate threads.

  2007-08-13 (3.4.2)

    1. Fix a database corruption bug that might occur if a ROLLBACK
       command is executed in auto-vacuum mode and a very small
       sqlite3_soft_heap_limit is set. Ticket #2565.
    2. Add the ability to run a full regression test with a small
       sqlite3_soft_heap_limit.
    3. Fix other minor problems with using small soft heap limits.
    4. Work-around for GCC bug 32575.
    5. Improved error detection of misused aggregate functions.
    6. Improvements to the amalgamation generator script so that all
       symbols are prefixed with either SQLITE_PRIVATE or SQLITE_API.

  2007-07-20 (3.4.1)

    1. Fix a bug in VACUUM that can lead to database corruptio if two
       processes are connected to the database at the same time and one
       VACUUMs then the other then modifies the database.
    2. The expression "+column" is now considered the same as "column"
       when computing the collating sequence to use on the expression.
    3. In the TCL language interface, "@variable" instead of "$variable"
       always binds as a blob.
    4. Added PRAGMA freelist_count for determining the current size of the
       freelist.
    5. The PRAGMA auto_vacuum=incremental setting is now persistent.
    6. Add FD_CLOEXEC to all open files under Unix.
    7. Fix a bug in the min()/max() optimization when applied to
       descending indices.
    8. Make sure the TCL language interface works correctly with 64-bit
       integers on 64-bit machines.
    9. Allow the value -9223372036854775808 as an integer literal in SQL
       statements.
   10. Add the capability of "hidden" columns in virtual tables.
   11. Use the macro SQLITE_PRIVATE (defaulting to "static") on all
       internal functions in the amalgamation.
   12. Add pluggable tokenizers and ICU tokenization support to FTS2
   13. Other minor bug fixes and documentation enhancements

  2007-06-18 (3.4.0)

    1. Fix a bug that can lead to database corruption if an SQLITE_BUSY
       error occurs in the middle of an explicit transaction and that
       transaction is later committed. Ticket #2409.
    2. Fix a bug that can lead to database corruption if autovacuum mode
       is on and a malloc() failure follows a CREATE TABLE or CREATE INDEX
       statement which itself follows a cache overflow inside a
       transaction. See ticket #2418.
    3. Added explicit upper bounds on the sizes and quantities of things
       SQLite can process. This change might cause compatibility problems
       for applications that use SQLite in the extreme, which is why the
       current release is 3.4.0 instead of 3.3.18.
    4. Added support for Incremental BLOB I/O.
    5. Added the sqlite3_bind_zeroblob() API and the zeroblob() SQL
       function.
    6. Added support for Incremental Vacuum.
    7. Added the SQLITE_MIXED_ENDIAN_64BIT_FLOAT compile-time option to
       support ARM7 processors with goofy endianness.
    8. Removed all instances of sprintf() and strcpy() from the core
       library.
    9. Added support for International Components for Unicode (ICU) to the
       full-text search extensions.
   10. In the Windows OS driver, reacquire a SHARED lock if an attempt to
       acquire an EXCLUSIVE lock fails. Ticket #2354
   11. Fix the REPLACE() function so that it returns NULL if the second
       argument is an empty string. Ticket #2324.
   12. Document the hazards of type conversions in sqlite3_column_blob()
       and related APIs. Fix unnecessary type conversions. Ticket #2321.
   13. Internationalization of the TRIM() function. Ticket #2323
   14. Use memmove() instead of memcpy() when moving between memory
       regions that might overlap. Ticket #2334
   15. Fix an optimizer bug involving subqueries in a compound SELECT that
       has both an ORDER BY and a LIMIT clause. Ticket #2339.
   16. Make sure the sqlite3_snprintf() interface does not zero-terminate
       the buffer if the buffer size is less than 1. Ticket #2341
   17. Fix the built-in printf logic so that it prints "NaN" not "Inf" for
       floating-point NaNs. Ticket #2345
   18. When converting BLOB to TEXT, use the text encoding of the main
       database. Ticket #2349
   19. Keep the full precision of integers (if possible) when casting to
       NUMERIC. Ticket #2364
   20. Fix a bug in the handling of UTF16 codepoint 0xE000
   21. Consider explicit collate clauses when matching WHERE constraints
       to indices in the query optimizer. Ticket #2391
   22. Fix the query optimizer to correctly handle constant expressions in
       the ON clause of a LEFT JOIN. Ticket #2403
   23. Fix the query optimizer to handle rowid comparisons to NULL
       correctly. Ticket #2404
   24. Fix many potential segfaults that could be caused by malicious SQL
       statements.

  2007-04-25 (3.3.17)

    1. When the "write_version" value of the database header is larger
       than what the library understands, make the database read-only
       instead of unreadable.
    2. Other minor bug fixes

  2007-04-18 (3.3.16)

    1. Fix a bug that caused VACUUM to fail if NULLs appeared in a UNIQUE
       column.
    2. Reinstate performance improvements that were added in Version
       3.3.14 but regressed in Version 3.3.15.
    3. Fix problems with the handling of ORDER BY expressions on compound
       SELECT statements in subqueries.
    4. Fix a potential segfault when destroying locks on WinCE in a
       multi-threaded environment.
    5. Documentation updates.

  2007-04-09 (3.3.15)

    1. Fix a bug introduced in 3.3.14 that caused a rollback of CREATE
       TEMP TABLE to leave the database connection wedged.
    2. Fix a bug that caused an extra NULL row to be returned when a
       descending query was interrupted by a change to the database.
    3. The FOR EACH STATEMENT clause on a trigger now causes a syntax
       error. It used to be silently ignored.
    4. Fix an obscure and relatively harmless problem that might have
       caused a resource leak following an I/O error.
    5. Many improvements to the test suite. Test coverage now exceeded 98%

  2007-04-02 (3.3.14)

    1. Fix a bug (ticket #2273) that could cause a segfault when the IN
       operator is used one one term of a two-column index and the
       right-hand side of the IN operator contains a NULL.
    2. Added a new OS interface method for determining the sector size of
       underlying media: sqlite3OsSectorSize().
    3. A new algorithm for statements of the form INSERT INTO table1
       SELECT * FROM table2 is faster and reduces fragmentation. VACUUM
       uses statements of this form and thus runs faster and defragments
       better.
    4. Performance enhancements through reductions in disk I/O:
         a. Do not read the last page of an overflow chain when deleting
            the row - just add that page to the freelist.
         b. Do not store pages being deleted in the rollback journal.
         c. Do not read in the (meaningless) content of pages extracted
            from the freelist.
         d. Do not flush the page cache (and thus avoiding a cache refill)
            unless another process changes the underlying database file.
         e. Truncate rather than delete the rollback journal when
            committing a transaction in exclusive access mode, or when
            committing the TEMP database.
    5. Added support for exclusive access mode using "PRAGMA
       locking_mode=EXCLUSIVE"
    6. Use heap space instead of stack space for large buffers in the
       pager - useful on embedded platforms with stack-space limitations.
    7. Add a makefile target "sqlite3.c" that builds an amalgamation
       containing the core SQLite library C code in a single file.
    8. Get the library working correctly when compiled with GCC option
       "-fstrict-aliasing".
    9. Removed the vestigal SQLITE_PROTOCOL error.
   10. Improvements to test coverage, other minor bugs fixed, memory leaks
       plugged, code refactored and/or recommended in places for easier
       reading.

  2007-02-13 (3.3.13)

    1. Add a "fragmentation" measurement in the output of
       sqlite3_analyzer.
    2. Add the COLLATE operator used to explicitly set the collating
       sequence used by an expression. This feature is considered
       experimental pending additional testing.
    3. Allow up to 64 tables in a join - the old limit was 32.
    4. Added two new experimental functions: randomBlob() and hex(). Their
       intended use is to facilitate generating UUIDs.
    5. Fix a problem where PRAGMA count_changes was causing incorrect
       results for updates on tables with triggers
    6. Fix a bug in the ORDER BY clause optimizer for joins where the
       left-most table in the join is constrained by a UNIQUE index.
    7. Fixed a bug in the "copy" method of the TCL interface.
    8. Bug fixes in fts1 and fts2 modules.

  2007-01-27 (3.3.12)

    1. Fix another bug in the IS NULL optimization that was added in
       version 3.3.9.
    2. Fix an assertion fault that occurred on deeply nested views.
    3. Limit the amount of output that PRAGMA integrity_check generates.
    4. Minor syntactic changes to support a wider variety of compilers.

  2007-01-22 (3.3.11)

    1. Fix another bug in the implementation of the new
       sqlite3_prepare_v2() API. We'll get it right eventually...
    2. Fix a bug in the IS NULL optimization that was added in version
       3.3.9 - the bug was causing incorrect results on certain LEFT JOINs
       that included in the WHERE clause an IS NULL constraint for the
       right table of the LEFT JOIN.
    3. Make AreFileApisANSI() a no-op macro in WinCE since WinCE does not
       support this function.

  2007-01-09 (3.3.10)

    1. Fix bugs in the implementation of the new sqlite3_prepare_v2() API
       that can lead to segfaults.
    2. Fix 1-second round-off errors in the strftime() function
    3. Enhance the Windows OS layer to provide detailed error codes
    4. Work around a win2k problem so that SQLite can use single-character
       database file names
    5. The user_version and schema_version pragmas correctly set their
       column names in the result set
    6. Documentation updates

  2007-01-04 (3.3.9)

    1. Fix bugs in pager.c that could lead to database corruption if two
       processes both try to recover a hot journal at the same instant
    2. Added the sqlite3_prepare_v2() API.
    3. Fixed the ".dump" command in the command-line shell to show
       indices, triggers and views again.
    4. Change the table_info pragma so that it returns NULL for the
       default value if there is no default value
    5. Support for non-ASCII characters in win95 filenames
    6. Query optimizer enhancements:
         a. Optimizer does a better job of using indices to satisfy ORDER
            BY clauses that sort on the integer primary key
         b. Use an index to satisfy an IS NULL operator in the WHERE
            clause
         c. Fix a bug that was causing the optimizer to miss an OR
            optimization opportunity
         d. The optimizer has more freedom to reorder tables in the FROM
            clause even in there are LEFT joins.
    7. Extension loading supported added to WinCE
    8. Allow constraint names on the DEFAULT clause in a table definition
    9. Added the ".bail" command to the command-line shell
   10. Make CSV (comma separate value) output from the command-line shell
       more closely aligned to accepted practice
   11. Experimental FTS2 module added
   12. Use sqlite3_mprintf() instead of strdup() to avoid libc
       dependencies
   13. VACUUM uses a temporary file in the official TEMP folder, not in
       the same directory as the original database
   14. The prefix on temporary filenames on Windows is changed from
       "sqlite" to "etilqs".

  2006-10-09 (3.3.8)

    1. Support for full text search using the FTS1 module (beta)
    2. Added Mac OS X locking patches (beta - disabled by default)
    3. Introduce extended error codes and add error codes for various
       kinds of I/O errors.
    4. Added support for IF EXISTS on CREATE/DROP TRIGGER/VIEW
    5. Fix the regression test suite so that it works with Tcl8.5
    6. Enhance sqlite3_set_authorizer() to provide notification of calls
       to SQL functions.
    7. Added experimental API: sqlite3_auto_extension()
    8. Various minor bug fixes

  2006-08-12 (3.3.7)

    1. Added support for virtual tables (beta)
    2. Added support for dynamically loaded extensions (beta)
    3. The sqlite3_interrupt() routine can be called for a different
       thread
    4. Added the MATCH operator.
    5. The default file format is now 1.

  2006-06-06 (3.3.6)

    1. Plays better with virus scanners on Windows
    2. Faster :memory: databases
    3. Fix an obscure segfault in UTF-8 to UTF-16 conversions
    4. Added driver for OS/2
    5. Correct column meta-information returned for aggregate queries
    6. Enhanced output from EXPLAIN QUERY PLAN
    7. LIMIT 0 now works on subqueries
    8. Bug fixes and performance enhancements in the query optimizer
    9. Correctly handle NULL filenames in ATTACH and DETACH
   10. Improved syntax error messages in the parser
   11. Fix type coercion rules for the IN operator

  2006-04-05 (3.3.5)

    1. CHECK constraints use conflict resolution algorithms correctly.
    2. The SUM() function throws an error on integer overflow.
    3. Choose the column names in a compound query from the left-most
       SELECT instead of the right-most.
    4. The sqlite3_create_collation() function honors the
       SQLITE_UTF16_ALIGNED flag.
    5. SQLITE_SECURE_DELETE compile-time option causes deletes to
       overwrite old data with zeros.
    6. Detect integer overflow in abs().
    7. The random() function provides 64 bits of randomness instead of
       only 32 bits.
    8. Parser detects and reports automaton stack overflow.
    9. Change the round() function to return REAL instead of TEXT.
   10. Allow WHERE clause terms on the left table of a LEFT OUTER JOIN to
       contain aggregate subqueries.
   11. Skip over leading spaces in text to numeric conversions.
   12. Various minor bug and documentation typo fixes and performance
       enhancements.

  2006-02-11 (3.3.4)

    1. Fix a blunder in the Unix mutex implementation that can lead to
       deadlock on multithreaded systems.
    2. Fix an alignment problem on 64-bit machines
    3. Added the fullfsync pragma.
    4. Fix an optimizer bug that could have caused some unusual LEFT OUTER
       JOINs to give incorrect results.
    5. The SUM function detects integer overflow and converts to
       accumulating an approximate result using floating point numbers
    6. Host parameter names can begin with '@' for compatibility with SQL
       Server.
    7. Other miscellaneous bug fixes

  2006-01-31 (3.3.3)

    1. Removed support for an ON CONFLICT clause on CREATE INDEX - it
       never worked correctly so this should not present any backward
       compatibility problems.
    2. Authorizer callback now notified of ALTER TABLE ADD COLUMN commands
    3. After any changes to the TEMP database schema, all prepared
       statements are invalidated and must be recreated using a new call
       to sqlite3_prepare()
    4. Other minor bug fixes in preparation for the first stable release
       of version 3.3

  2006-01-24 (3.3.2 beta)

    1. Bug fixes and speed improvements. Improved test coverage.
    2. Changes to the OS-layer interface: mutexes must now be recursive.
    3. Discontinue the use of thread-specific data for out-of-memory
       exception handling

  2006-01-16 (3.3.1 alpha)

    1. Countless bug fixes
    2. Speed improvements
    3. Database connections can now be used by multiple threads, not just
       the thread in which they were created.

  2006-01-11 (3.3.0 alpha)

    1. CHECK constraints
    2. IF EXISTS and IF NOT EXISTS clauses on CREATE/DROP TABLE/INDEX.
    3. DESC indices
    4. More efficient encoding of boolean values resulting in smaller
       database files
    5. More aggressive SQLITE_OMIT_FLOATING_POINT
    6. Separate INTEGER and REAL affinity
    7. Added a virtual function layer for the OS interface
    8. "exists" method added to the TCL interface
    9. Improved response to out-of-memory errors
   10. Database cache can be optionally shared between connections in the
       same thread
   11. Optional READ UNCOMMITTED isolation (instead of the default
       isolation level of SERIALIZABLE) and table level locking when
       database connections share a common cache.

  2005-12-19 (3.2.8)

    1. Fix an obscure bug that can cause database corruption under the
       following unusual circumstances: A large INSERT or UPDATE statement
       which is part of an even larger transaction fails due to a
       uniqueness constraint but the containing transaction commits.

  2005-12-19 (2.8.17)

    1. Fix an obscure bug that can cause database corruption under the
       following unusual circumstances: A large INSERT or UPDATE statement
       which is part of an even larger transaction fails due to a
       uniqueness contraint but the containing transaction commits.

  2005-09-24 (3.2.7)

    1. GROUP BY now considers NULLs to be equal again, as it should
    2. Now compiles on Solaris and OpenBSD and other Unix variants that
       lack the fdatasync() function
    3. Now compiles on MSVC++6 again
    4. Fix uninitialized variables causing malfunctions for various
       obscure queries
    5. Correctly compute a LEFT OUTER JOINs that is constrained on the
       left table only

  2005-09-17 (3.2.6)

    1. Fix a bug that can cause database corruption if a VACUUM (or
       autovacuum) fails and is rolled back on a database that is larger
       than 1GiB
    2. LIKE optimization now works for columns with COLLATE NOCASE
    3. ORDER BY and GROUP BY now use bounded memory
    4. Added support for COUNT(DISTINCT expr)
    5. Change the way SUM() handles NULL values in order to comply with
       the SQL standard
    6. Use fdatasync() instead of fsync() where possible in order to speed
       up commits slightly
    7. Use of the CROSS keyword in a join turns off the table reordering
       optimization
    8. Added the experimental and undocumented EXPLAIN QUERY PLAN
       capability
    9. Use the unicode API in Windows

  2005-08-27 (3.2.5)

    1. Fix a bug effecting DELETE and UPDATE statements that changed more
       than 40960 rows.
    2. Change the makefile so that it no longer requires GNUmake
       extensions
    3. Fix the --enable-threadsafe option on the configure script
    4. Fix a code generator bug that occurs when the left-hand side of an
       IN operator is constant and the right-hand side is a SELECT
       statement
    5. The PRAGMA synchronous=off statement now disables syncing of the
       master journal file in addition to the normal rollback journals

  2005-08-24 (3.2.4)

    1. Fix a bug introduced in the previous release that can cause a
       segfault while generating code for complex WHERE clauses.
    2. Allow floating point literals to begin or end with a decimal point.

  2005-08-21 (3.2.3)

    1. Added support for the CAST operator
    2. Tcl interface allows BLOB values to be transferred to user-defined
       functions
    3. Added the "transaction" method to the Tcl interface
    4. Allow the DEFAULT value of a column to call functions that have
       constant operands
    5. Added the ANALYZE command for gathering statistics on indices and
       using those statistics when picking an index in the optimizer
    6. Remove the limit (formerly 100) on the number of terms in the WHERE
       clause
    7. The right-hand side of the IN operator can now be a list of
       expressions instead of just a list of constants
    8. Rework the optimizer so that it is able to make better use of
       indices
    9. The order of tables in a join is adjusted automatically to make
       better use of indices
   10. The IN operator is now a candidate for optimization even if the
       left-hand side is not the left-most term of the index. Multiple IN
       operators can be used with the same index.
   11. WHERE clause expressions using BETWEEN and OR are now candidates
       for optimization
   12. Added the "case_sensitive_like" pragma and the
       SQLITE_CASE_SENSITIVE_LIKE compile-time option to set its default
       value to "on".
   13. Use indices to help with GLOB expressions and LIKE expressions too
       when the case_sensitive_like pragma is enabled
   14. Added support for grave-accent quoting for compatibility with MySQL
   15. Improved test coverage
   16. Dozens of minor bug fixes

  2005-06-12 (3.2.2)

    1. Added the sqlite3_db_handle() API
    2. Added the sqlite3_get_autocommit() API
    3. Added a REGEXP operator to the parser. There is no function to back
       up this operator in the standard build but users can add their own
       using sqlite3_create_function()
    4. Speed improvements and library footprint reductions.
    5. Fix byte alignment problems on 64-bit architectures.
    6. Many, many minor bug fixes and documentation updates.

  2005-03-29 (3.2.1)

    1. Fix a memory allocation error in the new ADD COLUMN comment.
    2. Documentation updates

  2005-03-21 (3.2.0)

    1. Added support for ALTER TABLE ADD COLUMN.
    2. Added support for the "T" separator in ISO-8601 date/time strings.
    3. Improved support for Cygwin.
    4. Numerous bug fixes and documentation updates.

  2005-03-17 (3.1.6)

    1. Fix a bug that could cause database corruption when inserting
       record into tables with around 125 columns.
    2. sqlite3_step() is now much more likely to invoke the busy handler
       and less likely to return SQLITE_BUSY.
    3. Fix memory leaks that used to occur after a malloc() failure.

  2005-03-11 (3.1.5)

    1. The ioctl on Mac OS X to control syncing to disk is F_FULLFSYNC,
       not F_FULLSYNC. The previous release had it wrong.

  2005-03-11 (3.1.4)

    1. Fix a bug in autovacuum that could cause database corruption if a
       CREATE UNIQUE INDEX fails because of a constraint violation. This
       problem only occurs if the new autovacuum feature introduced in
       version 3.1 is turned on.
    2. The F_FULLSYNC ioctl (currently only supported on Mac OS X) is
       disabled if the synchronous pragma is set to something other than
       "full".
    3. Add additional forward compatibility to the future version 3.2
       database file format.
    4. Fix a bug in WHERE clauses of the form (rowid<'2')
    5. New SQLITE_OMIT_... compile-time options added
    6. Updates to the man page
    7. Remove the use of strcasecmp() from the shell
    8. Windows DLL exports symbols Tclsqlite_Init and Sqlite_Init

  2005-02-19 (3.1.3)

    1. Fix a problem with VACUUM on databases from which tables containing
       AUTOINCREMENT have been dropped.
    2. Add forward compatibility to the future version 3.2 database file
       format.
    3. Documentation updates

  2005-02-15 (3.1.2)

    1. Fix a bug that can lead to database corruption if there are two
       open connections to the same database and one connection does a
       VACUUM and the second makes some change to the database.
    2. Allow "?" parameters in the LIMIT clause.
    3. Fix VACUUM so that it works with AUTOINCREMENT.
    4. Fix a race condition in AUTOVACUUM that can lead to corrupt
       databases
    5. Add a numeric version number to the sqlite3.h include file.
    6. Other minor bug fixes and performance enhancements.

  2005-02-15 (2.8.16)

    1. Fix a bug that can lead to database corruption if there are two
       open connections to the same database and one connection does a
       VACUUM and the second makes some change to the database.
    2. Correctly handle quoted names in CREATE INDEX statements.
    3. Fix a naming conflict between sqlite.h and sqlite3.h.
    4. Avoid excess heap usage when copying expressions.
    5. Other minor bug fixes.

  2005-02-01 (3.1.1 BETA)

    1. Automatic caching of prepared statements in the TCL interface
    2. ATTACH and DETACH as well as some other operations cause existing
       prepared statements to expire.
    3. Numerous minor bug fixes

  2005-01-21 (3.1.0 ALPHA)

    1. Autovacuum support added
    2. CURRENT_TIME, CURRENT_DATE, and CURRENT_TIMESTAMP added
    3. Support for the EXISTS clause added.
    4. Support for correlated subqueries added.
    5. Added the ESCAPE clause on the LIKE operator.
    6. Support for ALTER TABLE ... RENAME TABLE ... added
    7. AUTOINCREMENT keyword supported on INTEGER PRIMARY KEY
    8. Many SQLITE_OMIT_ macros inserts to omit features at compile-time
       and reduce the library footprint.
    9. The REINDEX command was added.
   10. The engine no longer consults the main table if it can get all the
       information it needs from an index.
   11. Many nuisance bugs fixed.

  2004-10-12 (3.0.8)

    1. Add support for DEFERRED, IMMEDIATE, and EXCLUSIVE transactions.
    2. Allow new user-defined functions to be created when there are
       already one or more precompiled SQL statements.
    3.
    4. Fix portability problems for MinGW/MSYS.
    5. Fix a byte alignment problem on 64-bit Sparc machines.
    6. Fix the ".import" command of the shell so that it ignores \r
       characters at the end of lines.
    7. The "csv" mode option in the shell puts strings inside
       double-quotes.
    8. Fix typos in documentation.
    9. Convert array constants in the code to have type "const".
   10. Numerous code optimizations, specially optimizations designed to
       make the code footprint smaller.

  2004-09-18 (3.0.7)

    1. The BTree module allocates large buffers using malloc() instead of
       off of the stack, in order to play better on machines with limited
       stack space.
    2. Fixed naming conflicts so that versions 2.8 and 3.0 can be linked
       and used together in the same ANSI-C source file.
    3. New interface: sqlite3_bind_parameter_index()
    4. Add support for wildcard parameters of the form: "?nnn"
    5. Fix problems found on 64-bit systems.
    6. Removed encode.c file (containing unused routines) from the version
       3.0 source tree.
    7. The sqlite3_trace() callbacks occur before each statement is
       executed, not when the statement is compiled.
    8. Makefile updates and miscellaneous bug fixes.

  2004-09-02 (3.0.6 beta)

    1. Better detection and handling of corrupt database files.
    2. The sqlite3_step() interface returns SQLITE_BUSY if it is unable to
       commit a change because of a lock
    3. Combine the implementations of LIKE and GLOB into a single
       pattern-matching subroutine.
    4. Miscellaneous code size optimizations and bug fixes

  2004-08-29 (3.0.5 beta)

    1. Support for ":AAA" style bind parameter names.
    2. Added the new sqlite3_bind_parameter_name() interface.
    3. Support for TCL variable names embedded in SQL statements in the
       TCL bindings.
    4. The TCL bindings transfer data without necessarily doing a
       conversion to a string.
    5. The database for TEMP tables is not created until it is needed.
    6. Add the ability to specify an alternative temporary file directory
       using the "sqlite_temp_directory" global variable.
    7. A compile-time option (SQLITE_BUSY_RESERVED_LOCK) causes the busy
       handler to be called when there is contention for a RESERVED lock.
    8. Various bug fixes and optimizations

  2004-08-09 (3.0.4 beta)

    1. CREATE TABLE and DROP TABLE now work correctly as prepared
       statements.
    2. Fix a bug in VACUUM and UNIQUE indices.
    3. Add the ".import" command to the command-line shell.
    4. Fix a bug that could cause index corruption when an attempt to
       delete rows of a table is blocked by a pending query.
    5. Library size optimizations.
    6. Other minor bug fixes.

  2004-07-22 (2.8.15)

    1. This is a maintenance release only. Various minor bugs have been
       fixed and some portability enhancements are added.

  2004-07-22 (3.0.3 beta)

    1. The second beta release for SQLite 3.0.
    2. Add support for "PRAGMA page_size" to adjust the page size of the
       database.
    3. Various bug fixes and documentation updates.

  2004-06-30 (3.0.2 beta)

    1. The first beta release for SQLite 3.0.

  2004-06-22 (3.0.1 alpha)

    1. *** Alpha Release - Research And Testing Use Only ***
    2. Lots of bug fixes.

  2004-06-18 (3.0.0 alpha)

    1. *** Alpha Release - Research And Testing Use Only ***
    2. Support for internationalization including UTF-8, UTF-16, and user
       defined collating sequences.
    3. New file format that is 25% to 35% smaller for typical use.
    4. Improved concurrency.
    5. Atomic commits for ATTACHed databases.
    6. Remove cruft from the APIs.
    7. BLOB support.
    8. 64-bit rowids.
    9. More information.

  2004-06-09 (2.8.14)

    1. Fix the min() and max() optimizer so that it works when the FROM
       clause consists of a subquery.
    2. Ignore extra whitespace at the end of of "." commands in the shell.
    3. Bundle sqlite_encode_binary() and sqlite_decode_binary() with the
       library.
    4. The TEMP_STORE and DEFAULT_TEMP_STORE pragmas now work.
    5. Code changes to compile cleanly using OpenWatcom.
    6. Fix VDBE stack overflow problems with INSTEAD OF triggers and NULLs
       in IN operators.
    7. Add the global variable sqlite_temp_directory which if set defines
       the directory in which temporary files are stored.
    8. sqlite_interrupt() plays well with VACUUM.
    9. Other minor bug fixes.

  2004-03-08 (2.8.13)

    1. Refactor parts of the code in order to make the code footprint
       smaller. The code is now also a little bit faster.
    2. sqlite_exec() is now implemented as a wrapper around
       sqlite_compile() and sqlite_step().
    3. The built-in min() and max() functions now honor the difference
       between NUMERIC and TEXT datatypes. Formerly, min() and max()
       always assumed their arguments were of type NUMERIC.
    4. New HH:MM:SS modifier to the built-in date/time functions.
    5. Experimental sqlite_last_statement_changes() API added. Fixed the
       last_insert_rowid() function so that it works correctly with
       triggers.
    6. Add functions prototypes for the database encryption API.
    7. Fix several nuisance bugs.

  2004-02-08 (2.8.12)

    1. Fix a bug that will might corrupt the rollback journal if a power
       failure or external program halt occurs in the middle of a COMMIT.
       The corrupt journal can lead to database corruption when it is
       rolled back.
    2. Reduce the size and increase the speed of various modules,
       especially the virtual machine.
    3. Allow "<expr> IN <table>" as a shorthand for "<expr> IN (SELECT *
       FROM <table>".
    4. Optimizations to the sqlite_mprintf() routine.
    5. Make sure the MIN() and MAX() optimizations work within subqueries.

  2004-01-14 (2.8.11)

    1. Fix a bug in how the IN operator handles NULLs in subqueries. The
       bug was introduced by the previous release.

  2004-01-14 (2.8.10)

    1. Fix a potential database corruption problem on Unix caused by the
       fact that all POSIX advisory locks are cleared whenever you close()
       a file. The work around it to embargo all close() calls while locks
       are outstanding.
    2. Performance enhancements on some corner cases of COUNT(*).
    3. Make sure the in-memory backend response sanely if malloc() fails.
    4. Allow sqlite_exec() to be called from within user-defined SQL
       functions.
    5. Improved accuracy of floating-point conversions using "long
       double".
    6. Bug fixes in the experimental date/time functions.

  2004-01-06 (2.8.9)

    1. Fix a 32-bit integer overflow problem that could result in corrupt
       indices in a database if large negative numbers (less than
       -2147483648) were inserted into an indexed numeric column.
    2. Fix a locking problem on multi-threaded Linux implementations.
    3. Always use "." instead of "," as the decimal point even if the
       locale requests ",".
    4. Added UTC to localtime conversions to the experimental date/time
       functions.
    5. Bug fixes to date/time functions.

  2003-12-18 (2.8.8)

    1. Fix a critical bug introduced into 2.8.0 which could cause database
       corruption.
    2. Fix a problem with 3-way joins that do not use indices
    3. The VACUUM command now works with the non-callback API
    4. Improvements to the "PRAGMA integrity_check" command

  2003-12-04 (2.8.7)

    1. Added experimental sqlite_bind() and sqlite_reset() APIs.
    2. If the name of the database is an empty string, open a new database
       in a temporary file that is automatically deleted when the database
       is closed.
    3. Performance enhancements in the Lemon-generated parser
    4. Experimental date/time functions revised.
    5. Disallow temporary indices on permanent tables.
    6. Documentation updates and typo fixes
    7. Added experimental sqlite_progress_handler() callback API
    8. Removed support for the Oracle8 outer join syntax.
    9. Allow GLOB and LIKE operators to work as functions.
   10. Other minor documentation and makefile changes and bug fixes.

  2003-08-22 (2.8.6)

    1. Moved the CVS repository to www.sqlite.org
    2. Update the NULL-handling documentation.
    3. Experimental date/time functions added.
    4. Bug fix: correctly evaluate a view of a view without segfaulting.
    5. Bug fix: prevent database corruption if you dropped a trigger that
       had the same name as a table.
    6. Bug fix: allow a VACUUM (without segfaulting) on an empty database
       after setting the EMPTY_RESULT_CALLBACKS pragma.
    7. Bug fix: if an integer value will not fit in a 32-bit int, store it
       in a double instead.
    8. Bug fix: Make sure the journal file directory entry is committed to
       disk before writing the database file.

  2003-07-22 (2.8.5)

    1. Make LIMIT work on a compound SELECT statement.
    2. LIMIT 0 now shows no rows. Use LIMIT -1 to see all rows.
    3. Correctly handle comparisons between an INTEGER PRIMARY KEY and a
       floating point number.
    4. Fix several important bugs in the new ATTACH and DETACH commands.
    5. Updated the NULL-handling document.
    6. Allow NULL arguments in sqlite_compile() and sqlite_step().
    7. Many minor bug fixes

  2003-06-29 (2.8.4)

    1. Enhanced the "PRAGMA integrity_check" command to verify indices.
    2. Added authorization hooks for the new ATTACH and DETACH commands.
    3. Many documentation updates
    4. Many minor bug fixes

  2003-06-04 (2.8.3)

    1. Fix a problem that will corrupt the indices on a table if you do an
       INSERT OR REPLACE or an UPDATE OR REPLACE on a table that contains
       an INTEGER PRIMARY KEY plus one or more indices.
    2. Fix a bug in Windows locking code so that locks work correctly when
       simultaneously accessed by Win95 and WinNT systems.
    3. Add the ability for INSERT and UPDATE statements to refer to the
       "rowid" (or "_rowid_" or "oid") columns.
    4. Other important bug fixes

  2003-05-17 (2.8.2)

    1. Fix a problem that will corrupt the database file if you drop a
       table from the main database that has a TEMP index.

  2003-05-17 (2.8.1)

    1. Reactivated the VACUUM command that reclaims unused disk space in a
       database file.
    2. Added the ATTACH and DETACH commands to allow interacting with
       multiple database files at the same time.
    3. Added support for TEMP triggers and indices.
    4. Added support for in-memory databases.
    5. Removed the experimental sqlite_open_aux_file(). Its function is
       subsumed in the new ATTACH command.
    6. The precedence order for ON CONFLICT clauses was changed so that ON
       CONFLICT clauses on BEGIN statements have a higher precedence than
       ON CONFLICT clauses on constraints.
    7. Many, many bug fixes and compatibility enhancements.

  2003-02-16 (2.8.0)

    1. Modified the journal file format to make it more resistant to
       corruption that can occur after an OS crash or power failure.
    2. Added a new C/C++ API that does not use callback for returning
       data.

  2003-01-25 (2.7.6)

    1. Performance improvements. The library is now much faster.
    2. Added the sqlite_set_authorizer() API. Formal documentation has not
       been written - see the source code comments for instructions on how
       to use this function.
    3. Fix a bug in the GLOB operator that was preventing it from working
       with upper-case letters.
    4. Various minor bug fixes.

  2002-12-28 (2.7.5)

    1. Fix an uninitialized variable in pager.c which could (with a
       probability of about 1 in 4 billion) result in a corrupted
       database.

  2002-12-17 (2.7.4)

    1. Database files can now grow to be up to 2^41 bytes. The old limit
       was 2^31 bytes.
    2. The optimizer will now scan tables in the reverse if doing so will
       satisfy an ORDER BY ... DESC clause.
    3. The full pathname of the database file is now remembered even if a
       relative path is passed into sqlite_open(). This allows the library
       to continue operating correctly after a chdir().
    4. Speed improvements in the VDBE.
    5. Lots of little bug fixes.

  2002-10-31 (2.7.3)

    1. Various compiler compatibility fixes.
    2. Fix a bug in the "expr IN ()" operator.
    3. Accept column names in parentheses.
    4. Fix a problem with string memory management in the VDBE
    5. Fix a bug in the "table_info" pragma"
    6. Export the sqlite_function_type() API function in the Windows DLL
    7. Fix locking behavior under Windows
    8. Fix a bug in LEFT OUTER JOIN

  2002-09-25 (2.7.2)

    1. Prevent journal file overflows on huge transactions.
    2. Fix a memory leak that occurred when sqlite_open() failed.
    3. Honor the ORDER BY and LIMIT clause of a SELECT even if the result
       set is used for an INSERT.
    4. Do not put write locks on the file used to hold TEMP tables.
    5. Added documentation on SELECT DISTINCT and on how SQLite handles
       NULLs.
    6. Fix a problem that was causing poor performance when many thousands
       of SQL statements were executed by a single sqlite_exec() call.

  2002-08-31 (2.7.1)

    1. Fix a bug in the ORDER BY logic that was introduced in version
       2.7.0
    2. C-style comments are now accepted by the tokenizer.
    3. INSERT runs a little faster when the source is a SELECT statement.

  2002-08-25 (2.7.0)

    1. Make a distinction between numeric and text values when sorting.
       Text values sort according to memcmp(). Numeric values sort in
       numeric order.
    2. Allow multiple simultaneous readers under Windows by simulating the
       reader/writers locks that are missing from Win95/98/ME.
    3. An error is now returned when trying to start a transaction if
       another transaction is already active.

  2002-08-13 (2.6.3)

    1. Add the ability to read both little-endian and big-endian
       databases. So a database created under SunOS or Mac OS X can be
       read and written under Linux or Windows and vice versa.
    2. Convert to the new website: http://www.sqlite.org/
    3. Allow transactions to span Linux Threads
    4. Bug fix in the processing of the ORDER BY clause for GROUP BY
       queries

  2002-07-31 (2.6.2)

    1. Text files read by the COPY command can now have line terminators
       of LF, CRLF, or CR.
    2. SQLITE_BUSY is handled correctly if encountered during database
       initialization.
    3. Fix to UPDATE triggers on TEMP tables.
    4. Documentation updates.

  2002-07-19 (2.6.1)

    1. Include a static string in the library that responds to the RCS
       "ident" command and which contains the library version number.
    2. Fix an assertion failure that occurred when deleting all rows of a
       table with the "count_changes" pragma turned on.
    3. Better error reporting when problems occur during the automatic
       2.5.6 to 2.6.0 database format upgrade.

  2002-07-18 (2.6.0)

    1. Change the format of indices to correct a design flaw the
       originated with version 2.1.0. *** This is an incompatible file
       format change *** When version 2.6.0 or later of the library
       attempts to open a database file created by version 2.5.6 or
       earlier, it will automatically and irreversibly convert the file
       format. Make backup copies of older database files before opening
       them with version 2.6.0 of the library.

  2002-07-07 (2.5.6)

    1. Fix more problems with rollback. Enhance the test suite to exercise
       the rollback logic extensively in order to prevent any future
       problems.

  2002-07-06 (2.5.5)

    1. Fix a bug which could cause database corruption during a rollback.
       This bugs was introduced in version 2.4.0 by the freelist
       optimization of checkin [410].
    2. Fix a bug in aggregate functions for VIEWs.
    3. Other minor changes and enhancements.

  2002-07-01 (2.5.4)

    1. Make the "AS" keyword optional again.
    2. The datatype of columns now appear in the 4th argument to the
       callback.
    3. Added the sqlite_open_aux_file() API, though it is still mostly
       undocumented and untested.
    4. Added additional test cases and fixed a few bugs that those test
       cases found.

  2002-06-25 (2.5.3)

    1. Bug fix: Database corruption can occur due to the optimization that
       was introduced in version 2.4.0 (check-in [410]). The problem
       should now be fixed. The use of versions 2.4.0 through 2.5.2 is not
       recommended.

  2002-06-25 (2.5.2)

    1. Added the new SQLITE_TEMP_MASTER table which records the schema for
       temporary tables in the same way that SQLITE_MASTER does for
       persistent tables.
    2. Added an optimization to UNION ALL
    3. Fixed a bug in the processing of LEFT OUTER JOIN
    4. The LIMIT clause now works on subselects
    5. ORDER BY works on subselects
    6. There is a new TypeOf() function used to determine if an expression
       is numeric or text.
    7. Autoincrement now works for INSERT from a SELECT.

  2002-06-19 (2.5.1)

    1. The query optimizer now attempts to implement the ORDER BY clause
       using an index. Sorting is still used if not suitable index is
       available.

  2002-06-17 (2.5.0)

    1. Added support for row triggers.
    2. Added SQL-92 compliant handling of NULLs.
    3. Add support for the full SQL-92 join syntax and LEFT OUTER JOINs.
    4. Double-quoted strings interpreted as column names not text
       literals.
    5. Parse (but do not implement) foreign keys.
    6. Performance improvements in the parser, pager, and WHERE clause
       code generator.
    7. Make the LIMIT clause work on subqueries. (ORDER BY still does not
       work, though.)
    8. Added the "%Q" expansion to sqlite_*_printf().
    9. Bug fixes too numerous to mention (see the change log).

  2002-05-10 (2.4.12)

    1. Added logic to detect when the library API routines are called out
       of sequence.

  2002-05-08 (2.4.11)

    1. Bug fix: Column names in the result set were not being generated
       correctly for some (rather complex) VIEWs. This could cause a
       segfault under certain circumstances.

  2002-05-03 (2.4.10)

    1. Bug fix: Generate correct column headers when a compound SELECT is
       used as a subquery.
    2. Added the sqlite_encode_binary() and sqlite_decode_binary()
       functions to the source tree. But they are not yet linked into the
       library.
    3. Documentation updates.
    4. Export the sqlite_changes() function from Windows DLLs.
    5. Bug fix: Do not attempt the subquery flattening optimization on
       queries that lack a FROM clause. To do so causes a segfault.

  2002-04-22 (2.4.9)

    1. Fix a bug that was causing the precompiled binary of SQLITE.EXE to
       report "out of memory" under Windows 98.

  2002-04-20 (2.4.8)

    1. Make sure VIEWs are created after their corresponding TABLEs in the
       output of the .dump command in the shell.
    2. Speed improvements: Do not do synchronous updates on TEMP tables.
    3. Many improvements and enhancements to the shell.
    4. Make the GLOB and LIKE operators functions that can be overridden
       by a programmer. This allows, for example, the LIKE operator to be
       changed to be case sensitive.

  2002-04-12 (2.4.7)

    1. Add the ability to put TABLE.* in the column list of a SELECT
       statement.
    2. Permit SELECT statements without a FROM clause.
    3. Added the last_insert_rowid() SQL function.
    4. Do not count rows where the IGNORE conflict resolution occurs in
       the row count.
    5. Make sure functions expressions in the VALUES clause of an INSERT
       are correct.
    6. Added the sqlite_changes() API function to return the number of row
       that changed in the most recent operation.

  2002-04-02 (2.4.6)

    1. Bug fix: Correctly handle terms in the WHERE clause of a join that
       do not contain a comparison operator.

  2002-04-02 (2.4.5)

    1. Bug fix: Correctly handle functions that appear in the WHERE clause
       of a join.
    2. When the PRAGMA vdbe_trace=ON is set, correctly print the P3
       operand value when it is a pointer to a structure rather than a
       pointer to a string.
    3. When inserting an explicit NULL into an INTEGER PRIMARY KEY,
       convert the NULL value into a unique key automatically.

  2002-03-30 (2.4.4)

    1. Allow "VIEW" to be a column name
    2. Added support for CASE expressions (patch from Dan Kennedy)
    3. Added RPMS to the delivery (patches from Doug Henry)
    4. Fix typos in the documentation
    5. Cut over configuration management to a new CVS repository with its
       own CVSTrac bug tracking system.

  2002-03-23 (2.4.3)

    1. Fix a bug in SELECT that occurs when a compound SELECT is used as a
       subquery in the FROM of a SELECT.
    2. The sqlite_get_table() function now returns an error if you give it
       two or more SELECTs that return different numbers of columns.

  2002-03-20 (2.4.2)

    1. Bug fix: Fix an assertion failure that occurred when ROWID was a
       column in a SELECT statement on a view.
    2. Bug fix: Fix an uninitialized variable in the VDBE that would could
       an assert failure.
    3. Make the os.h header file more robust in detecting when the compile
       is for Windows and when it is for Unix.

  2002-03-13 (2.4.1)

    1. Using an unnamed subquery in a FROM clause would cause a segfault.
    2. The parser now insists on seeing a semicolon or the end of input
       before executing a statement. This avoids an accidental disaster if
       the WHERE keyword is misspelled in an UPDATE or DELETE statement.

  2002-03-11 (2.4.0)

    1. Change the name of the sanity_check PRAGMA to integrity_check and
       make it available in all compiles.
    2. SELECT min() or max() of an indexed column with no WHERE or GROUP
       BY clause is handled as a special case which avoids a complete
       table scan.
    3. Automatically generated ROWIDs are now sequential.
    4. Do not allow dot-commands of the command-line shell to occur in the
       middle of a real SQL command.
    5. Modifications to the Lemon parser generator so that the parser
       tables are 4 times smaller.
    6. Added support for user-defined functions implemented in C.
    7. Added support for new functions: coalesce(), lower(), upper(), and
       random()
    8. Added support for VIEWs.
    9. Added the subquery flattening optimizer.
   10. Modified the B-Tree and Pager modules so that disk pages that do
       not contain real data (free pages) are not journaled and are not
       written from memory back to the disk when they change. This does
       not impact database integrity, since the pages contain no real
       data, but it does make large INSERT operations about 2.5 times
       faster and large DELETEs about 5 times faster.
   11. Made the CACHE_SIZE pragma persistent
   12. Added the SYNCHRONOUS pragma
   13. Fixed a bug that was causing updates to fail inside of transactions
       when the database contained a temporary table.

  2002-02-19 (2.3.3)

    1. Allow identifiers to be quoted in square brackets, for
       compatibility with MS-Access.
    2. Added support for sub-queries in the FROM clause of a SELECT.
    3. More efficient implementation of sqliteFileExists() under Windows.
       (by Joel Luscy)
    4. The VALUES clause of an INSERT can now contain expressions,
       including scalar SELECT clauses.
    5. Added support for CREATE TABLE AS SELECT
    6. Bug fix: Creating and dropping a table all within a single
       transaction was not working.

  2002-02-14 (2.3.2)

    1. Bug fix: There was an incorrect assert() in pager.c. The real code
       was all correct (as far as is known) so everything should work OK
       if you compile with -DNDEBUG=1. When asserts are not disabled,
       there could be a fault.

  2002-02-13 (2.3.1)

    1. Bug fix: An assertion was failing if "PRAGMA full_column_names=ON;"
       was set and you did a query that used a rowid, like this: "SELECT
       rowid, * FROM ...".

  2002-02-03 (2.3.0)

    1. Fix a serious bug in the INSERT command which was causing data to
       go into the wrong columns if the data source was a SELECT and the
       INSERT clauses specified its columns in some order other than the
       default.
    2. Added the ability to resolve constraint conflicts is ways other
       than an abort and rollback. See the documentation on the "ON
       CONFLICT" clause for details.
    3. Temporary files are now automatically deleted by the operating
       system when closed. There are no more dangling temporary files on a
       program crash. (If the OS crashes, fsck will delete the file after
       reboot under Unix. I do not know what happens under Windows.)
    4. NOT NULL constraints are honored.
    5. The COPY command puts NULLs in columns whose data is '\N'.
    6. In the COPY command, backslash can now be used to escape a newline.
    7. Added the SANITY_CHECK pragma.

  2002-01-28 (2.2.5)

    1. Important bug fix: the IN operator was not working if either the
       left-hand or right-hand side was derived from an INTEGER PRIMARY
       KEY.
    2. Do not escape the backslash '\' character in the output of the
       sqlite command-line access program.

  2002-01-22 (2.2.4)

    1. The label to the right of an AS in the column list of a SELECT can
       now be used as part of an expression in the WHERE, ORDER BY, GROUP
       BY, and/or HAVING clauses.
    2. Fix a bug in the -separator command-line option to the sqlite
       command.
    3. Fix a problem with the sort order when comparing upper-case strings
       against characters greater than 'Z' but less than 'a'.
    4. Report an error if an ORDER BY or GROUP BY expression is constant.

  2002-01-16 (2.2.3)

    1. Fix warning messages in VC++ 7.0. (Patches from nicolas352001)
    2. Make the library thread-safe. (The code is there and appears to
       work but has not been stressed.)
    3. Added the new sqlite_last_insert_rowid() API function.

  2002-01-14 (2.2.2)

    1. Bug fix: An assertion was failing when a temporary table with an
       index had the same name as a permanent table created by a separate
       process.
    2. Bug fix: Updates to tables containing an INTEGER PRIMARY KEY and an
       index could fail.

  2002-01-09 (2.2.1)

    1. Bug fix: An attempt to delete a single row of a table with a WHERE
       clause of "ROWID=x" when no such rowid exists was causing an error.
    2. Bug fix: Passing in a NULL as the 3rd parameter to sqlite_open()
       would sometimes cause a coredump.
    3. Bug fix: DROP TABLE followed by a CREATE TABLE with the same name
       all within a single transaction was causing a coredump.
    4. Makefile updates from A. Rottmann

  2001-12-22 (2.2.0)

    1. Columns of type INTEGER PRIMARY KEY are actually used as the
       primary key in underlying B-Tree representation of the table.
    2. Several obscure, unrelated bugs were found and fixed while
       implemented the integer primary key change of the previous bullet.
    3. Added the ability to specify "*" as part of a larger column list in
       the result section of a SELECT statement. For example: "SELECT
       rowid, * FROM table1;".
    4. Updates to comments and documentation.

  2001-12-15 (2.1.7)

    1. Fix a bug in CREATE TEMPORARY TABLE which was causing the table to
       be initially allocated in the main database file instead of in the
       separate temporary file. This bug could cause the library to suffer
       an assertion failure and it could cause "page leaks" in the main
       database file.
    2. Fix a bug in the b-tree subsystem that could sometimes cause the
       first row of a table to be repeated during a database scan.

  2001-12-14 (2.1.6)

    1. Fix the locking mechanism yet again to prevent sqlite_exec() from
       returning SQLITE_PROTOCOL unnecessarily. This time the bug was a
       race condition in the locking code. This change affects both POSIX
       and Windows users.

  2001-12-06 (2.1.5)

    1. Fix for another problem (unrelated to the one fixed in 2.1.4) that
       sometimes causes sqlite_exec() to return SQLITE_PROTOCOL
       unnecessarily. This time the bug was in the POSIX locking code and
       should not effect Windows users.

  2001-12-05 (2.1.4)

    1. Sometimes sqlite_exec() would return SQLITE_PROTOCOL when it should
       have returned SQLITE_BUSY.
    2. The fix to the previous bug uncovered a deadlock which was also
       fixed.
    3. Add the ability to put a single .command in the second argument of
       the sqlite shell
    4. Updates to the FAQ

  2001-11-24 (2.1.3)

    1. Fix the behavior of comparison operators (ex: "<", "==", etc.) so
       that they are consistent with the order of entries in an index.
    2. Correct handling of integers in SQL expressions that are larger
       than what can be represented by the machine integer.

  2001-11-23 (2.1.2)

    1. Changes to support 64-bit architectures.
    2. Fix a bug in the locking protocol.
    3. Fix a bug that could (rarely) cause the database to become
       unreadable after a DROP TABLE due to corruption to the
       SQLITE_MASTER table.
    4. Change the code so that version 2.1.1 databases that were rendered
       unreadable by the above bug can be read by this version of the
       library even though the SQLITE_MASTER table is (slightly)
       corrupted.

  2001-11-13 (2.1.1)

    1. Bug fix: Sometimes arbitrary strings were passed to the callback
       function when the actual value of a column was NULL.

  2001-11-12 (2.1.0)

    1. Change the format of data records so that records up to 16MB in
       size can be stored.
    2. Change the format of indices to allow for better query
       optimization.
    3. Implement the "LIMIT ... OFFSET ..." clause on SELECT statements.

  2001-11-03 (2.0.8)

    1. Made selected parameters in API functions const. This should be
       fully backwards compatible.
    2. Documentation updates
    3. Simplify the design of the VDBE by restricting the number of
       sorters and lists to 1. In practice, no more than one sorter and
       one list was ever used anyhow.

  2001-10-22 (2.0.7)

    1. Any UTF-8 character or ISO8859 character can be used as part of an
       identifier.
    2. Patches from Christian Werner to improve ODBC compatibility and to
       fix a bug in the round() function.
    3. Plug some memory leaks that use to occur if malloc() failed. We
       have been and continue to be memory leak free as long as malloc()
       works.
    4. Changes to some test scripts so that they work on Windows in
       addition to Unix.

  2001-10-19 (2.0.6)

    1. Added the EMPTY_RESULT_CALLBACKS pragma
    2. Support for UTF-8 and ISO8859 characters in column and table names.
    3. Bug fix: Compute correct table names with the FULL_COLUMN_NAMES
       pragma is turned on.

  2001-10-15 (2.0.5)

    1. Added the COUNT_CHANGES pragma.
    2. Changes to the FULL_COLUMN_NAMES pragma to help out the ODBC
       driver.
    3. Bug fix: "SELECT count(*)" was returning NULL for empty tables. Now
       it returns 0.

  2001-10-13 (2.0.4)

    1. Bug fix: an obscure and relatively harmless bug was causing one of
       the tests to fail when gcc optimizations are turned on. This
       release fixes the problem.

  2001-10-13 (2.0.3)

    1. Bug fix: the sqlite_busy_timeout() function was delaying 1000 times
       too long before failing.
    2. Bug fix: an assertion was failing if the disk holding the database
       file became full or stopped accepting writes for some other reason.
       New tests were added to detect similar problems in the future.
    3. Added new operators: & (bitwise-and) | (bitwise-or), ~
       (ones-complement), << (shift left), >> (shift right).
    4. Added new functions: round() and abs().

  2001-10-09 (2.0.2)

    1. Fix two bugs in the locking protocol. (One was masking the other.)
    2. Removed some unused "#include " that were causing problems for
       VC++.
    3. Fixed sqlite.h so that it is usable from C++
    4. Added the FULL_COLUMN_NAMES pragma. When set to "ON", the names of
       columns are reported back as TABLE.COLUMN instead of just COLUMN.
    5. Added the TABLE_INFO() and INDEX_INFO() pragmas to help support the
       ODBC interface.
    6. Added support for TEMPORARY tables and indices.

  2001-10-02 (2.0.1)

    1. Remove some C++ style comments from btree.c so that it will compile
       using compilers other than gcc.
    2. The ".dump" output from the shell does not work if there are
       embedded newlines anywhere in the data. This is an old bug that was
       carried forward from version 1.0. To fix it, the ".dump" output no
       longer uses the COPY command. It instead generates INSERT
       statements.
    3. Extend the expression syntax to support "expr NOT NULL" (with a
       space between the "NOT" and the "NULL") in addition to "expr
       NOTNULL" (with no space).

  2001-09-28 (2.0.0)

    1. Automatically build binaries for Linux and Windows and put them on
       the website.

  2001-09-28 (2.0-alpha-4)

    1. Incorporate makefile patches form A. Rottmann to use LIBTOOL

  2001-09-27 (2.0-alpha-3)

    1. SQLite now honors the UNIQUE keyword in CREATE UNIQUE INDEX.
       Primary keys are required to be unique.
    2. File format changed back to what it was for alpha-1
    3. Fixes to the rollback and locking behavior

  2001-09-20 (2.0-alpha-2)

    1. Initial release of version 2.0. The idea of renaming the library to
       "SQLus" was abandoned in favor of keeping the "SQLite" name and
       bumping the major version number.
    2. The pager and btree subsystems added back. They are now the only
       available backend.
    3. The Dbbe abstraction and the GDBM and memory drivers were removed.
    4. Copyright on all code was disclaimed. The library is now in the
       public domain.

  2001-07-23 (1.0.32)

    1. Pager and btree subsystems removed. These will be used in a
       follow-on SQL server library named "SQLus".
    2. Add the ability to use quoted strings as table and column names in
       expressions.

  2001-04-15 (1.0.31)

    1. Pager subsystem added but not yet used.
    2. More robust handling of out-of-memory errors.
    3. New tests added to the test suite.

  2001-04-06 (1.0.30)

    1. Remove the sqlite_encoding TCL variable that was introduced in the
       previous version.
    2. Add options -encoding and -tcl-uses-utf to the sqlite TCL command.
    3. Add tests to make sure that tclsqlite was compiled using Tcl header
       files and libraries that match.

  2001-04-05 (1.0.29)

    1. The library now assumes data is stored as UTF-8 if the
       --enable-utf8 option is given to configure. The default behavior is
       to assume iso8859-x, as it has always done. This only makes a
       difference for LIKE and GLOB operators and the LENGTH and SUBSTR
       functions.
    2. If the library is not configured for UTF-8 and the Tcl library is
       one of the newer ones that uses UTF-8 internally, then a conversion
       from UTF-8 to iso8859 and back again is done inside the TCL
       interface.

  2001-04-04 (1.0.28)

    1. Added limited support for transactions. At this point, transactions
       will do table locking on the GDBM backend. There is no support
       (yet) for rollback or atomic commit.
    2. Added special column names ROWID, OID, and _ROWID_ that refer to
       the unique random integer key associated with every row of every
       table.
    3. Additional tests added to the regression suite to cover the new
       ROWID feature and the TCL interface bugs mentioned below.
    4. Changes to the Lemon parser generator to help it work better when
       compiled using MSVC.
    5. Bug fixes in the TCL interface identified by Oleg Oleinick.

  2001-03-20 (1.0.27)

    1. When doing DELETE and UPDATE, the library used to write the record
       numbers of records to be deleted or updated into a temporary file.
       This is changed so that the record numbers are held in memory.
    2. The DELETE command without a WHILE clause just removes the database
       files from the disk, rather than going through and deleting record
       by record.

  2001-03-20 (1.0.26)

    1. A serious bug fixed on Windows. Windows users should upgrade. No
       impact to Unix.

  2001-03-15 (1.0.25)

    1. Modify the test scripts to identify tests that depend on system
       load and processor speed and to warn the user that a failure of one
       of those (rare) tests does not necessarily mean the library is
       malfunctioning. No changes to code.

  2001-03-14 (1.0.24)

    1. Fix a bug which was causing the UPDATE command to fail on systems
       where "malloc(0)" returns NULL. The problem does not appear on
       Windows, Linux, or HPUX but does cause the library to fail on QNX.

  2001-02-20 (1.0.23)

    1. An unrelated (and minor) bug from Mark Muranwski fixed. The
       algorithm for figuring out where to put temporary files for a
       "memory:" database was not working quite right.

  2001-02-19 (1.0.22)

    1. The previous fix was not quite right. This one seems to work
       better.

  2001-02-19 (1.0.21)

    1. The UPDATE statement was not working when the WHERE clause
       contained some terms that could be satisfied using indices and
       other terms that could not. Fixed.

  2001-02-11 (1.0.20)

    1. Merge development changes into the main trunk. Future work toward
       using a BTree file structure will use a separate CVS source tree.
       This CVS tree will continue to support the GDBM version of SQLite
       only.

  2001-02-06 (1.0.19)

    1. Fix a strange (but valid) C declaration that was causing problems
       for QNX. No logical changes.

  2001-01-04 (1.0.18)

    1. Print the offending SQL statement when an error occurs.
    2. Do not require commas between constraints in CREATE TABLE
       statements.
    3. Added the "-echo" option to the shell.
    4. Changes to comments.

  2000-12-10 (1.0.17)

    1. Rewrote sqlite_complete() to make it faster.
    2. Minor tweaks to other code to make it run a little faster.
    3. Added new tests for sqlite_complete() and for memory leaks.

  2000-11-28 (1.0.16)

    1. Documentation updates. Mostly fixing of typos and spelling errors.

  2000-10-23 (1.0.15)

    1. Documentation updates
    2. Some sanity checking code was removed from the inner loop of vdbe.c
       to help the library to run a little faster. The code is only
       removed if you compile with -DNDEBUG.

  2000-10-19 (1.0.14)

    1. Added a "memory:" backend driver that stores its database in an
       in-memory hash table.

  2000-10-19 (1.0.13)

    1. Break out the GDBM driver into a separate file in anticipation to
       added new drivers.
    2. Allow the name of a database to be prefixed by the driver type. For
       now, the only driver type is "gdbm:".

  2000-10-17 (1.0.12)

    1. Fixed an off-by-one error that was causing a coredump in the '%q'
       format directive of the new sqlite_..._printf() routines.
    2. Added the sqlite_interrupt() interface.
    3. In the shell, sqlite_interrupt() is invoked when the user presses
       Control-C
    4. Fixed some instances where sqlite_exec() was returning the wrong
       error code.

  2000-10-11 (1.0.10)

    1. Added notes on how to compile for Windows95/98.
    2. Removed a few variables that were not being used. Etc.

  2000-10-09 (1.0.9)

    1. Added the sqlite_..._printf() interface routines.
    2. Modified the sqlite shell program to use the new interface
       routines.
    3. Modified the sqlite shell program to print the schema for the
       built-in SQLITE_MASTER table, if explicitly requested.

  2000-09-30 (1.0.8)

    1. Begin writing documentation on the TCL interface.

  2000-09-29 (Not Released)

    1. Added the sqlite_get_table() API
    2. Updated the documentation for due to the above change.
    3. Modified the sqlite shell to make use of the new sqlite_get_table()
       API in order to print a list of tables in multiple columns, similar
       to the way "ls" prints filenames.
    4. Modified the sqlite shell to print a semicolon at the end of each
       CREATE statement in the output of the ".schema" command.

  2000-09-21 (Not Released)

    1. Change the tclsqlite "eval" method to return a list of results if
       no callback script is specified.
    2. Change tclsqlite.c to use the Tcl_Obj interface
    3. Add tclsqlite.c to the libsqlite.a library

  2000-09-14 (1.0.5)

    1. Changed the print format for floating point values from "%g" to
       "%.15g".
    2. Changed the comparison function so that numbers in exponential
       notation (ex: 1.234e+05) sort in numerical order.

  2000-08-28 (1.0.4)

    1. Added functions length() and substr().
    2. Fix a bug in the sqlite shell program that was causing a coredump
       when the output mode was "column" and the first row of data
       contained a NULL.

  2000-08-22 (1.0.3)

    1. In the sqlite shell, print the "Database opened READ ONLY" message
       to stderr instead of stdout.
    2. In the sqlite shell, now print the version number on initial
       startup.
    3. Add the sqlite_version[] string constant to the library
    4. Makefile updates
    5. Bug fix: incorrect VDBE code was being generated for the following
       circumstance: a query on an indexed table containing a WHERE clause
       with an IN operator that had a subquery on its right-hand side.

  2000-08-18 (1.0.1)

    1. Fix a bug in the configure script.
    2. Minor revisions to the website.

  2000-08-17 (1.0)

    1. Change the sqlite program so that it can read databases for which
       it lacks write permission. (It used to refuse all access if it
       could not write.)

  2000-08-09

    1. Treat carriage returns as white space.

  2000-08-08

    1. Added pattern matching to the ".table" command in the "sqlite"
       command shell.

  2000-08-04

    1. Documentation updates
    2. Added "busy" and "timeout" methods to the Tcl interface

  2000-08-03

    1. File format version number was being stored in sqlite_master.tcl
       multiple times. This was harmless, but unnecessary. It is now
       fixed.

  2000-08-02

    1. The file format for indices was changed slightly in order to work
       around an inefficiency that can sometimes come up with GDBM when
       there are large indices having many entries with the same key. **
       Incompatible Change **

  2000-08-01

    1. The parser's stack was overflowing on a very long UPDATE statement.
       This is now fixed.

  2000-07-31

    1. Finish the VDBE tutorial.
    2. Added documentation on compiling to WinNT.
    3. Fix a configuration program for WinNT.
    4. Fix a configuration problem for HPUX.

  2000-07-29

    1. Better labels on column names of the result.

  2000-07-28

    1. Added the sqlite_busy_handler() and sqlite_busy_timeout()
       interface.

  2000-06-23

    1. Begin writing the VDBE tutorial.

  2000-06-21

    1. Clean up comments and variable names. Changes to documentation. No
       functional changes to the code.

  2000-06-19

    1. Column names in UPDATE statements were case sensitive. This mistake
       has now been fixed.

  2000-06-18

    1. Added the concatenate string operator (||)

  2000-06-12

    1. Added the fcnt() function to the SQL interpreter. The fcnt()
       function returns the number of database "Fetch" operations that
       have occurred. This function is designed for use in test scripts to
       verify that queries are efficient and appropriately optimized.
       Fcnt() has no other useful purpose, as far as I know.
    2. Added a bunch more tests that take advantage of the new fcnt()
       function. The new tests did not uncover any new problems.

  2000-06-08

    1. Added lots of new test cases
    2. Fix a few bugs discovered while adding test cases
    3. Begin adding lots of new documentation

  2000-06-06

    1. Added compound select operators: UNION, UNION ALL, INTERSECT, and
       EXCEPT
    2. Added support for using (SELECT ...) within expressions
    3. Added support for IN and BETWEEN operators
    4. Added support for GROUP BY and HAVING
    5. NULL values are now reported to the callback as a NULL pointer
       rather than an empty string.

  2000-06-03

    1. Added support for default values on columns of a table.
    2. Improved test coverage. Fixed a few obscure bugs found by the
       improved tests.

  2000-06-02

    1. All database files to be modified by an UPDATE, INSERT or DELETE
       are now locked before any changes are made to any files. This makes
       it safe (I think) to access the same database simultaneously from
       multiple processes.
    2. The code appears stable so we are now calling it "beta".

  2000-06-01

    1. Better support for file locking so that two or more processes (or
       threads) can access the same database simultaneously. More work
       needed in this area, though.

  2000-05-31

    1. Added support for aggregate functions (Ex: COUNT(*), MIN(...)) to
       the SELECT statement.
    2. Added support for SELECT DISTINCT ...

  2000-05-30

    1. Added the LIKE operator.
    2. Added a GLOB operator: similar to LIKE but it uses Unix shell
       globbing wildcards instead of the '%' and '_' wildcards of SQL.
    3. Added the COPY command patterned after PostgreSQL so that SQLite
       can now read the output of the pg_dump database dump utility of
       PostgreSQL.
    4. Added a VACUUM command that calls the gdbm_reorganize() function on
       the underlying database files.
    5. And many, many bug fixes...

  2000-05-29

    1. Initial Public Release of Alpha code
