                    ****** Recent Changes To SQLite ******
This file provides a high-level summary of changes to SQLite. For more detail,
refer the the checkin logs generated by CVS at http://cvs.hwaci.com:2080/
sqlite/timeline.
  2002 Apr 06 (2.4.7)
          * Add the ability to put TABLE.* in the column list of a SELECT
            statement.
          * Permit SELECT statements without a FROM clause.
          * Added the last_insert_rowid() SQL function.
  2002 Apr 02 (2.4.6)
          * Bug fix: Correctly handle terms in the WHERE clause of a join that
            do not contain a comparison operator.
  2002 Apr 01 (2.4.5)
          * Bug fix: Correctly handle functions that appear in the WHERE clause
            of a join.
          * 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.
          * When inserting an explicit NULL into an INTEGER PRIMARY KEY,
            convert the NULL value into a unique key automatically.
  2002 Mar 24 (2.4.4)
          * Allow "VIEW" to be a column name
          * Added support for CASE expressions (patch from Dan Kennedy)
          * Added RPMS to the delivery (patches from Doug Henry)
          * Fix typos in the documentation
          * Cut over configuration management to a new CVS repository with its
            own CVSTrac bug tracking system.
  2002 Mar 22 (2.4.3)
          * Fix a bug in SELECT that occurs when a compound SELECT is used as a
            subquery in the FROM of a SELECT.
          * The sqlite_get_table() function now returns an error if you give it
            two or more SELECTs that return different numbers of columns.
  2002 Mar 14 (2.4.2)
          * Bug fix: Fix an assertion failure that occurred when ROWID was a
            column in a SELECT statement on a view.
          * Bug fix: Fix an uninitialized variable in the VDBE that would could
            an assert failure.
          * Make the os.h header file more robust in detecting when the compile
            is for windows and when it is for unix.
  2002 Mar 13 (2.4.1)
          * Using an unnamed subquery in a FROM clause would cause a segfault.
          * 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 Mar 10 (2.4.0)
          * Change the name of the sanity_check PRAGMA to integrity_check and
            make it available in all compiles.
          * 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.
          * Automatically generated ROWIDs are now sequential.
          * Do not allow dot-commands of the command-line shell to occur in the
            middle of a real SQL command.
          * Modifications to the "lemon" parser generator so that the parser
            tables are 4 times smaller.
          * Added support for user-defined functions implemented in C.
          * Added support for new functions: coalesce(), lower(), upper(), and
            random()
          * Added support for VIEWs.
          * Added the subquery flattening optimizer.
          * Modified the B-Tree and Pager modules so that disk pages that do
            not contain real data (free pages) are not journalled 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.
          * Made the CACHE_SIZE pragma persistent
          * Added the SYNCHRONOUS pragma
          * Fixed a bug that was causing updates to fail inside of transactions
            when the database contained a temporary table.
  2002 Feb 18 (2.3.3)
          * Allow identifiers to be quoted in square brackets, for
            compatibility with MS-Access.
          * Added support for sub-queries in the FROM clause of a SELECT.
          * More efficient implementation of sqliteFileExists() under Windows.
            (by Joel Luscy)
          * The VALUES clause of an INSERT can now contain expressions,
            including scalar SELECT clauses.
          * Added support for CREATE TABLE AS SELECT
          * Bug fix: Creating and dropping a table all within a single
            transaction was not working.
  2002 Feb 14 (2.3.2)
          * 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 Feb 13 (2.3.1)
          * 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 Jan 30 (2.3.0)
          * 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.
          * 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.
          * 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.)
          * NOT NULL constraints are honored.
          * The COPY command puts NULLs in columns whose data is '\N'.
          * In the COPY command, backslash can now be used to escape a newline.
          * Added the SANITY_CHECK pragma.
  2002 Jan 28 (2.2.5)
          * 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.
          * Do not escape the backslash '\' character in the output of the
            sqlite command-line access program.
  2002 Jan 22 (2.2.4)
          * 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.
          * Fix a bug in the -separator command-line option to the sqlite
            command.
          * Fix a problem with the sort order when comparing upper-case strings
            against characters greater than 'Z' but less than 'a'.
          * Report an error if an ORDER BY or GROUP BY expression is constant.
  2002 Jan 16 (2.2.3)
          * Fix warning messages in VC++ 7.0. (Patches from nicolas352001)
          * Make the library thread-safe. (The code is there and appears to
            work but has not been stressed.)
          * Added the new sqlite_last_insert_rowid() API function.
  2002 Jan 13 (2.2.2)
          * 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.
          * Bug fix: Updates to tables containing an INTEGER PRIMARY KEY and an
            index could fail.
  2002 Jan 9 (2.2.1)
          * 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.
          * Bug fix: Passing in a NULL as the 3rd parameter to sqlite_open()
            would sometimes cause a coredump.
          * Bug fix: DROP TABLE followed by a CREATE TABLE with the same name
            all within a single transaction was causing a coredump.
          * Makefile updates from A. Rottmann
  2001 Dec 22 (2.2.0)
          * Columns of type INTEGER PRIMARY KEY are actually used as the
            primary key in underlying B-Tree representation of the table.
          * Several obscure, unrelated bugs were found and fixed while
            implemented the integer primary key change of the previous bullet.
          * 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;".
          * Updates to comments and documentation.
  2001 Dec 14 (2.1.7)
          * 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.
          * 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 Dec 14 (2.1.6)
          * 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 effects both POSIX
            and Windows users.
  2001 Dec 6 (2.1.5)
          * 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 Dec 4 (2.1.4)
          * Sometimes sqlite_exec() would return SQLITE_PROTOCOL when it should
            have returned SQLITE_BUSY.
          * The fix to the previous bug uncovered a deadlock which was also
            fixed.
          * Add the ability to put a single .command in the second argument of
            the sqlite shell
          * Updates to the FAQ
  2001 Nov 23 (2.1.3)
          * Fix the behavior of comparison operators (ex: "&lt", "==", etc.) so
            that they are consistent with the order of entries in an index.
          * Correct handling of integers in SQL expressions that are larger
            than what can be represented by the machine integer.
  2001 Nov 22 (2.1.2)
          * Changes to support 64-bit architectures.
          * Fix a bug in the locking protocol.
          * Fix a bug that could (rarely) cause the database to become
            unreadable after a DROP TABLE due to corruption to the
            SQLITE_MASTER table.
          * 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 Nov 13 (2.1.1)
          * Bug fix: Sometimes arbirary strings were passed to the callback
            function when the actual value of a column was NULL.
  2001 Nov 12 (2.1.0)
          * Change the format of data records so that records up to 16MB in
            size can be stored.
          * Change the format of indices to allow for better query
            optimization.
          * Implement the "LIMIT ... OFFSET ..." clause on SELECT statements.
  2001 Nov 3 (2.0.8)
          * Made selected parameters in API functions const. This should be
            fully backwards compatible.
          * Documentation updates
          * 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 Oct 21 (2.0.7)
          * Any UTF-8 character or ISO8859 character can be used as part of an
            identifier.
          * Patches from Christian Werner to improve ODBC compatibility and to
            fix a bug in the round() function.
          * 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.
          * Changes to some test scripts so that they work on Windows in
            addition to Unix.
  2001 Oct 19 (2.0.6)
          * Added the EMPTY_RESULT_CALLBACKS pragma
          * Support for UTF-8 and ISO8859 characters in column and table names.
          * Bug fix: Compute correct table names with the FULL_COLUMN_NAMES
            pragma is turned on.
  2001 Oct 14 (2.0.5)
          * Added the COUNT_CHANGES pragma.
          * Changes to the FULL_COLUMN_NAMES pragma to help out the ODBC
            driver.
          * Bug fix: "SELECT count(*)" was returning NULL for empty tables. Now
            it returns 0.
  2001 Oct 13 (2.0.4)
          * Bug fix: an abscure and relatively harmless bug was causing one of
            the tests to fail when gcc optimizations are turned on. This
            release fixes the problem.
  2001 Oct 13 (2.0.3)
          * Bug fix: the sqlite_busy_timeout() function was delaying 1000 times
            too long before failing.
          * 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.
          * Added new operators: & (bitwise-and) | (bitwise-or), ~ (ones-
            complement), << (shift left), >> (shift right).
          * Added new functions: round() and abs().
  2001 Oct 9 (2.0.2)
          * Fix two bugs in the locking protocol. (One was masking the other.)
          * Removed some unused "#include h>" that were causing problems for
            VC++.
          * Fixed sqlite.h so that it is usable from C++
          * Added the FULL_COLUMN_NAMES pragma. When set to "ON", the names of
            columns are reported back as TABLE.COLUMN instead of just COLUMN.
          * Added the TABLE_INFO() and INDEX_INFO() pragmas to help support the
            ODBC interface.
          * Added support for TEMPORARY tables and indices.
  2001 Oct 2 (2.0.1)
          * Remove some C++ style comments from btree.c so that it will compile
            using compilers other than gcc.
          * 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.
          * 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 Sep 28 (2.0.0)
          * Automatically build binaries for Linux and Windows and put them on
            the website.
  2001 Sep 28 (2.0-alpha-4)
          * Incorporate makefile patches form A. Rottmann to use LIBTOOL
  2001 Sep 27 (2.0-alpha-3)
          * SQLite now honors the UNIQUE keyword in CREATE UNIQUE INDEX.
            Primary keys are required to be unique.
          * File format changed back to what it was for alpha-1
          * Fixes to the rollback and locking behavior
  2001 Sep 20 (2.0-alpha-2)
          * 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.
          * The pager and btree subsystems added back. They are now the only
            available backend.
          * The Dbbe abstraction and the GDBM and memory drivers were removed.
          * Copyright on all code was disclaimed. The library is now in the
            public domain.
  2001 Jul 23 (1.0.32)
          * Pager and btree subsystems removed. These will be used in a follow-
            on SQL server library named "SQLus".
          * Add the ability to use quoted strings as table and column names in
            expressions.
  2001 Apr 14 (1.0.31)
          * Pager subsystem added but not yet used.
          * More robust handling of out-of-memory errors.
          * New tests added to the test suite.
  2001 Apr 6 (1.0.30)
          * Remove the sqlite_encoding TCL variable that was introduced in the
            previous version.
          * Add options -encoding and -tcl-uses-utf to the sqlite TCL command.
          * Add tests to make sure that tclsqlite was compiled using Tcl header
            files and libraries that match.
  2001 Apr 5 (1.0.29)
          * 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.
          * 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 Apr 4 (1.0.28)
          * 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.
          * Added special column names ROWID, OID, and _ROWID_ that refer to
            the unique random integer key associated with every row of every
            table.
          * Additional tests added to the regression suite to cover the new
            ROWID feature and the TCL interface bugs mentioned below.
          * Changes to the "lemon" parser generator to help it work better when
            compiled using MSVC.
          * Bug fixes in the TCL interface identified by Oleg Oleinick.
  2001 Mar 20 (1.0.27)
          * 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.
          * 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 Mar 20 (1.0.26)
          * A serious bug fixed on Windows. Windows users should upgrade. No
            impact to Unix.
  2001 Mar 15 (1.0.25)
          * 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 Mar 14 (1.0.24)
          * Fix a bug which was causing the UPDATE command to fail on systems
            where "malloc(0)" returns NULL. The problem does not appear
            Windows, Linux, or HPUX but does cause the library to fail on QNX.
  2001 Feb 19 (1.0.23)
          * 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 Feb 19 (1.0.22)
          * The previous fix was not quite right. This one seems to work
            better.
  2001 Feb 19 (1.0.21)
          * 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 Feb 11 (1.0.20)
          * 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 Feb 6 (1.0.19)
          * Fix a strange (but valid) C declaration that was causing problems
            for QNX. No logical changes.
  2001 Jan 4 (1.0.18)
          * Print the offending SQL statement when an error occurs.
          * Do not require commas between constraints in CREATE TABLE
            statements.
          * Added the "-echo" option to the shell.
          * Changes to comments.
  2000 Dec 10 (1.0.17)
          * Rewrote sqlite_complete() to make it faster.
          * Minor tweaks to other code to make it run a little faster.
          * Added new tests for sqlite_complete() and for memory leaks.
  2000 Dec 4 (1.0.16)
          * Documentation updates. Mostly fixing of typos and spelling errors.
  2000 Oct 23 (1.0.15)
          * Documentation updates
          * 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 Oct 19 (1.0.14)
          * Added a "memory:" backend driver that stores its database in an in-
            memory hash table.
  2000 Oct 18 (1.0.13)
          * Break out the GDBM driver into a separate file in anticipation to
            added new drivers.
          * Allow the name of a database to be prefixed by the driver type. For
            now, the only driver type is "gdbm:".
  2000 Oct 16 (1.0.12)
          * Fixed an off-by-one error that was causing a coredump in the '%q'
            format directive of the new sqlite_..._printf() routines.
          * Added the sqlite_interrupt() interface.
          * In the shell, sqlite_interrupt() is invoked when the user presses
            Control-C
          * Fixed some instances where sqlite_exec() was returning the wrong
            error code.
  2000 Oct 11 (1.0.10)
          * Added notes on how to compile for Windows95/98.
          * Removed a few variables that were not being used. Etc.
  2000 Oct 8 (1.0.9)
          * Added the sqlite_..._printf() interface routines.
          * Modified the sqlite shell program to use the new interface
            routines.
          * Modified the sqlite shell program to print the schema for the
            built-in SQLITE_MASTER table, if explicitly requested.
  2000 Sep 30 (1.0.8)
          * Begin writing documentation on the TCL interface.
  2000 Sep 29 (Not Released)
          * Added the sqlite_get_table() API
          * Updated the documentation for due to the above change.
          * 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.
          * Modified the sqlite shell to print a semicolon at the end of each
            CREATE statement in the output of the ".schema" command.
  2000 Sep 21 (Not Released)
          * Change the tclsqlite "eval" method to return a list of results if
            no callback script is specified.
          * Change tclsqlite.c to use the Tcl_Obj interface
          * Add tclsqlite.c to the libsqlite.a library
  2000 Sep 13 (Version 1.0.5)
          * Changed the print format for floating point values from "%g" to
            "%.15g".
          * Changed the comparison function so that numbers in exponential
            notation (ex: 1.234e+05) sort in numerical order.
  2000 Aug 28 (Version 1.0.4)
          * Added functions length() and substr().
          * 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 Aug 22 (Version 1.0.3)
          * In the sqlite shell, print the "Database opened READ ONLY" message
            to stderr instead of stdout.
          * In the sqlite shell, now print the version number on initial
            startup.
          * Add the sqlite_version[] string constant to the library
          * Makefile updates
          * 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 Aug 18 (Version 1.0.1)
          * Fix a bug in the configure script.
          * Minor revisions to the website.
  2000 Aug 17 (Version 1.0)
          * 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 Aug 9
          * Treat carriage returns as white space.
  2000 Aug 8
          * Added pattern matching to the ".table" command in the "sqlite"
            command shell.
  2000 Aug 4
          * Documentation updates
          * Added "busy" and "timeout" methods to the Tcl interface
  2000 Aug 3
          * File format version number was being stored in sqlite_master.tcl
            multiple times. This was harmless, but unnecessary. It is now
            fixed.
  2000 Aug 2
          * 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 Aug 1
          * The parser's stack was overflowing on a very long UPDATE statement.
            This is now fixed.
  2000 July 31
          * Finish the VDBE_tutorial.
          * Added documentation on compiling to WindowsNT.
          * Fix a configuration program for WindowsNT.
          * Fix a configuration problem for HPUX.
  2000 July 29
          * Better labels on column names of the result.
  2000 July 28
          * Added the sqlite_busy_handler() and sqlite_busy_timeout()
            interface.
  2000 June 23
          * Begin writing the VDBE_tutorial.
  2000 June 21
          * Clean up comments and variable names. Changes to documentation. No
            functional changes to the code.
  2000 June 19
          * Column names in UPDATE statements were case sensitive. This mistake
            has now been fixed.
  2000 June 16
          * Added the concatenate string operator (||)
  2000 June 12
          * 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.
          * Added a bunch more tests that take advantage of the new fcnt()
            function. The new tests did not uncover any new problems.
  2000 June 8
          * Added lots of new test cases
          * Fix a few bugs discovered while adding test cases
          * Begin adding lots of new documentation
  2000 June 6
          * Added compound select operators: UNION, UNION ALL, INTERSECT, and
            EXCEPT
          * Added support for using (SELECT ...) within expressions
          * Added support for IN and BETWEEN operators
          * Added support for GROUP BY and HAVING
          * NULL values are now reported to the callback as a NULL pointer
            rather than an empty string.
  2000 June 3
          * Added support for default values on columns of a table.
          * Improved test coverage. Fixed a few obscure bugs found by the
            improved tests.
  2000 June 2
          * 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.
          * The code appears stable so we are now calling it "beta".
  2000 June 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 May 31
          * Added support for aggregate functions (Ex: COUNT(*), MIN(...)) to
            the SELECT statement.
          * Added support for SELECT DISTINCT ...
  2000 May 30
          * Added the LIKE operator.
          * Added a GLOB operator: similar to LIKE but it uses Unix shell
            globbing wildcards instead of the '%' and '_' wildcards of SQL.
          * Added the COPY command patterned after PostgreSQL so that SQLite
            can now read the output of the pg_dump database dump utility of
            PostgreSQL.
          * Added a VACUUM command that that calls the gdbm_reorganize()
            function on the underlying database files.
          * And many, many bug fixes...
  2000 May 29
          * Initial Public Release of Alpha code
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