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## SQLite Release 3.13.0 On 2016-05-18

- Postpone I/O associated with TEMP files for as long as possible, with the hope that the I/O can ultimately be avoided completely.
- Merged the session extension into trunk.
- Added the ".auth ON|OFF" command to the command-line shell.
- Added the "--indent" option to the ".schema" and ".fullschema" commands of the command-line shell, to turn on pretty-printing.
- Added the ".eqp full" option to the command-line shell, that does both EXPLAIN and EXPLAIN QUERY PLAN on each statement that is evaluated.
- Improved unicode filename handling in the command-line shell on Windows.
- Improved resistance against goofy query planner decisions caused by incomplete or incorrect modifications to the sqlite_stat1 table by the application.
- 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.
- 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:

- 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
- 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.
- 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.
- 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:

- SQLITE_SOURCE_ID: "2016-05-18 10:57:30 fc49f556e48970561d7ab6a2f24fdd7d9eb81ff2"
- SHA1 for sqlite3.c: 9b9171b1e6ce7a980e6b714e9c0d9112657ad552

  Bug fixes backported into patch release 3.10.0 (2016-01-06):

  General improvements:

- Added support for LIKE, GLOB, and REGEXP operators on virtual tables.
- Added the colUsed field to sqlite3_index_info for use by the sqlite3_module.xBestIndex method.
- Enhance the PRAGMA cache_spill statement to accept a 32-bit integer parameter which is the threshold below which cache spilling is prohibited.
- 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.
- Added the "--transaction" option to sqldiff.
- Added the sqlite3_db_cacheflush() interface.
- Added the sqlite3_strlike() interface.
- 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.
- 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.
- 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.)
- Added the json_group_array() and json_group_object() SQL functions in the json extension.
- Added the SQLITE_LIKE_DOESNT_MATCH_BLOBS compile-time option.
- Many small performance optimizations.

  Portability enhancements:

- Work around a sign-extension bug in the optimizer of the HP C compiler on HP/UX. (details)

  Enhancements to the command-line shell:

- Added the ".changes ON|OFF" and ".vfsinfo" dot-commands.
- Translate between MBCS and UTF8 when running in cmd.exe on Windows.

  Enhancements to makefiles:

- Added the --enable-editline and --enable-static-shell options to the various autoconf-generated configure scripts.
- Omit all use of "awk" in the makefiles, to make building easier for MSVC users.

  Important fixes:

- 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.
- Fix an infinite-loop in the query planner that could occur on malformed common table expressions.
- Various bug fixes in the sqldiff tool.

  Bug fixes backported into patch release 3.9.2 (2015-11-02):

- Fix the schema parser so that it interprets certain (obscure and ill-formed) CREATE TABLE statements the same as legacy. Fix for ticket ac661962a2aeab3c331
- 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.

A complete list of SQLite releases in a single page and a chronology are both also available. A detailed history of every check-in is available at SQLite version control site.