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## SQLite Release 3.7.12 On 2012-05-14

- 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. Ticket 385a5b56b9.
- 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.
- SQLITE_SOURCE_ID: "2012-05-14 01:41:23 8654aa9540fe9fd210899d83d17f3f407096c004"
- SHA1 for sqlite3.c: 57e2104a0f7b3f528e7f6b7a8e553e2357ccd2e1

A complete list of SQLite releases in a single page is also available. A detailed history of every check-in is available at http://www.sqlite.org/src/timeline.