SQLite Release 3.7.12

Release 3.7.12 On 2012 May 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
  

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