Log Message:
Changes 3.15.0:
Added support for row values.
Allow deterministic SQL functions in the WHERE clause of a partial index.
Added the "modeof=filename" URI parameter on the unix VFS
Added support for SQLITE_DBCONFIG_MAINDBNAME.
Added the ability to VACUUM an ATTACH-ed database.
Enhancements to the command-line shell:
Add the ".testcase" and ".check" dot-commands.
Added the --new option to the ".open" dot-command, causing any prior \ 
content in the database to be purged prior to opening.
Enhance the fts5vocab virtual table to handle "ORDER BY term" efficiently.
Miscellaneous micro-optimizations reduce CPU usage by more than 7% on common \ 
workloads. Most optimization in this release has been on the front-end \ 
(sqlite3_prepare_v2()).

Bug Fixes:

The multiply operator now correctly detects 64-bit integer overflow and promotes \ 
to floating point in all corner-cases.
Correct handling of columns with redundant unique indexes when those columns are \ 
used on the LHS of an IN operator.
Skip NULL entries on range queries in indexes on expressions.
Ensure that the AUTOINCREMENT counters in the sqlite_sequence table are \ 
initialized doing "Xfer Optimization" on "INSERT ... SELECT" \ 
statements.
Make sure the ORDER BY LIMIT optimization (from check-in 559733b09e) works with \ 
IN operators on INTEGER PRIMARY KEYs.