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.
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.
* Added the sqlite3_errstr() interface.
* Avoid invoking the sqlite3_trace() callback multiple times when a statement is automatically reprepared due to SQLITE_SCHEMA errors.
* Added support for Windows Phone 8 platforms
* Enhance IN operator processing to make use of indices with numeric affinities.
* 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.
* 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.
* Add the ability to implement FROM clause subqueries as coroutines rather that manifesting the subquery into a temporary table.
* Enhancements the command-line shell:
* Added the ".print" command
* Negative numbers in the ".width" command cause right-alignment
* Add the ".wheretrace" command when compiled with SQLITE_DEBUG
* Added the busy_timeout pragma.
* Added the instr() SQL function.
* Added the SQLITE_FCNTL_BUSYHANDLER file control, used to allow VFS implementations to get access to the busy handler callback.
* The xDelete method in the built-in VFSes now return SQLITE_IOERR_DELETE_NOENT if the file to be deleted does not exist.
* Enhanced support for QNX.
* Work around an optimizer bug in the MSVC compiler when targeting ARM.
* Bug fix: Avoid various concurrency problems in shared cache mode.
* Bug fix: Avoid a deadlock or crash if the backup API, shared cache, and the SQLite Encryption Extension are all used at once.
* Bug fix: SQL functions created using the TCL interface honor the "nullvalue" setting.
* Bug fix: Fix a 32-bit overflow problem on CREATE INDEX for databases larger than 16GB.
* Bug fix: Avoid segfault when using the COLLATE operator inside of a CHECK constraint or view in shared cache mode.
* 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.
* Ensure that floating point values are preserved exactly when reconstructing a
database from the output of the ".dump" command of the command-line shell.
* Added the sqlite3_close_v2() interface.
* Updated the command-line shell so that it can be built using
SQLITE_OMIT_FLOATING_POINT and SQLITE_OMIT_AUTOINIT.
* Improvements to the windows makefiles and build processes.
* 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.
* 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.
* Performance enhancements in the sorter used by ORDER BY and CREATE INDEX.
* Added the SQLITE_DISABLE_FTS4_DEFERRED compile-time option.
* Better handling of aggregate queries where the aggregate functions are
contained within subqueries.
* Enhance the query planner so that it will try to use a covering index on
queries that make use of or optimization.
* 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.
* Recognize and use the mode=memory query parameter in URI filenames.
* Avoid resetting the schema of shared cache connections when any one
connection closes. Instead, wait for the last connection to close before
reseting the schema.
* 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.
* Adjust the unix driver to avoid unnecessary calls to fchown().
* Add interfaces sqlite3_quota_ferror() and sqlite3_quota_file_available() to
the test_quota.c module.
* 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.
* Fix a bug in the 3.7.12 release that can cause a segfault for certain obscure
nested aggregate queries.
* Fix various other minor test script problems.
* Add the SQLITE_DBSTATUS_CACHE_WRITE option for sqlite3_db_status().
* Optimize the typeof() and length() SQL functions so that they avoid unnecessary reading of database content from disk.
* Add the FTS4 "merge" command, the FTS4 "automerge" command, and the FTS4 "integrity-check" command.
* Report the name of specific CHECK constraints that fail.
* In the command-line shell, use popen() instead of fopen() if the first character of the argument to the ".output" command is "|".
* Make use of OVERLAPPED in the windows VFS to avoid some system calls and thereby obtain a performance improvement.
* More aggressive optimization of the AND operator when one side or the other is always false.
* Improved performance of queries with many OR-connected terms in the WHERE clause that can all be indexed.
* 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.
* Enhance the PRAGMA integrity_check command to use much less memory when processing multi-gigabyte databases.
* New interfaces added to the test_quota.c add-on module.
* Added the ".trace" dot-command to the command-line shell.
* Allow virtual table constructors to be invoked recursively.
* Improved optimization of ORDER BY clauses on compound queries.
* Improved optimization of aggregate subqueries contained within an aggregate query.
* Bug fix: Fix the RELEASE command so that it does not cancel pending queries. This repairs a problem introduced in 3.7.11.
* 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.
* 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.
* Enhance the INSERT syntax to allow multiple rows to be inserted via
the VALUES clause.
* Enhance the CREATE VIRTUAL TABLE command to support the IF NOT EXISTS clause.
* Added the sqlite3_stricmp() interface as a counterpart to sqlite3_strnicmp().
* Added the sqlite3_db_readonly() interface.
* Added the SQLITE_FCNTL_PRAGMA file control, giving VFS implementations
the ability to add new PRAGMA statements or to override built-in PRAGMAs.
* 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.
* Added support for the FTS4 languageid option.
* 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.
* Pending statements no longer block ROLLBACK. Instead, the pending statement
will return SQLITE_ABORT upon next access after the ROLLBACK.
* Improvements to the handling of CSV inputs in the command-line shell
* 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.
* 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.
* 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.
* 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.
* Added the sqlite3_db_release_memory() interface and the shrink_memory pragma.
* Added the sqlite3_db_filename() interface.
* Added the sqlite3_stmt_busy() interface.
* Added the sqlite3_uri_boolean() and sqlite3_uri_int64() interfaces.
* 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.
* Enhanced the default memory allocator to make use of _msize() on windows,
malloc_size() on Mac, and malloc_usable_size() on Linux.
* Enhanced the query planner to support index queries with range constraints on
the rowid.
* 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.
* 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.
* Enhanced the windows VFS so that all system calls can be overridden using the
xSetSystemCall interface.
* Updated the "unix-dotfile" VFS to use locking directories with mkdir() and
rmdir() instead of locking files with open() and unlink().
* Enhancements to the test_quota.c extension to support stdio-like interfaces
with quotas.
* Change the unix VFS to be tolerant of read() system calls that return less
then the full number of requested bytes.
* Change both unix and windows VFSes to report a sector size of 4096 instead of
the old default of 512.
* In the TCL Interface, add the -uri option to the "sqlite3" TCL command used
for creating new database connection objects.
* 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.
* 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.
* Bug fix: Change the VDBE so that all registers are initialized to Invalid
instead of NULL.
* Bug fix: Fix problems that can result from 32-bit integer overflow.
* 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 **
* Added options SQLITE_DBSTATUS_CACHE_HIT and SQLITE_DBSTATUS_CACHE_MISS to the
sqlite3_db_status() interface.
* Removed support for SQLITE_ENABLE_STAT2, replacing it with the much more
capable SQLITE_ENABLE_STAT3 option.
* Enhancements to the sqlite3_analyzer utility program, including the --pageinfo
and --stats options and support for multiplexed databases.
* Enhance the sqlite3_data_count() interface so that it can be used to determine
if SQLITE_DONE has been seen on the prepared statement.
* 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.
* Increase the default lookaside memory allocator allocation size from 100 to
128 bytes.
* 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.
* Added the SQLITE_DIRECT_OVERFLOW_READ compile-time option, causing overflow
pages to be read directly from the database file, bypassing the page cache.
* Remove limits on the magnitude of precision and width value in the format
specifiers of the sqlite3_mprintf() family of string rendering routines.
* Fix a bug that prevent ALTER TABLE ... RENAME from working on some virtual
tables in a database with a UTF16 encoding.
* Fix a bug in ASCII-to-float conversion that causes slow performance and
incorrect results when converting numbers with ridiculously large exponents.
* 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.
* Fix a bug that prevented the page_count and quick_check pragmas from working
correctly if their names were capitalized.
* Fix a bug that caused VACUUM to fail if the count_changes pragma was engaged.
* 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.
* Orders of magnitude performance improvement for CREATE INDEX on very large
tables.
* Improved the windows VFS to better defend against interference from
anti-virus software.
* Improved query plan optimization when the DISTINCT keyword is present.
* Allow more system calls to be overridden in the unix VFS - to provide better
support for chromium sandboxes.
* Increase the default size of a lookahead cache line from 100 to 128 bytes.
* Enhancements to the test_quota.c module so that it can track preexisting
files.
* Bug fix: Virtual tables now handle IS NOT NULL constraints correctly.
* Bug fixes: Correctly handle nested correlated subqueries used with indices in
a WHERE clause.
* Fix a bug causing PRAGMA case_sensitive_like statements compiled using
sqlite3_prepare() to fail with an SQLITE_SCHEMA error.
Changes 3.7.7:
* Add support for URI filenames
* Add the sqlite3_vtab_config() interface in support of ON CONFLICT clauses
with virtual tables.
* Add the xSavepoint, xRelease and xRollbackTo methods in virtual tables in
support of SAVEPOINT for virtual tables.
* Update the built-in FTS3/FTS4 and RTREE virtual tables to support ON CONFLICT
clauses and REPLACE.
* Avoid unnecessary reparsing of the database schema.
* Added support for the FTS4 prefix option and the FTS4 order option.
* Allow WAL-mode databases to be opened read-only as long as there is an
existing read/write connection.
* Added support for short filenames.
* Added the sqlite3_vsnprintf() interface.
* Added the SQLITE_DBSTATUS_LOOKASIDE_HIT, SQLITE_DBSTATUS_LOOKASIDE_MISS_SIZE,
and SQLITE_DBSTATUS_LOOKASIDE_MISS_FULL options for the sqlite3_db_status()
interface.
* Added the SQLITE_OMIT_AUTORESET compile-time option.
* Added the SQLITE_DEFAULT_FOREIGN_KEYS compile-time option.
* Updates to sqlite3_stmt_readonly() so that its result is well-defined for all
prepared statements and so that it works with VACUUM.
* Added the "-heap" option to the command-line shell
* Fix a bug involving frequent changes in and out of WAL mode and VACUUM that
could (in theory) cause database corruption.
* 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.
* Change the xFileControl() methods on all built-in VFSes to return
SQLITE_NOTFOUND instead of SQLITE_ERROR for an unrecognized operation code.
* 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.
