- New Version 3.7.16:
* Added the PRAGMA foreign_key_check command.
* Added new extended error codes for all SQLITE_CONSTRAINT
errors
* Added the SQLITE_READONLY_ROLLBACK extended error code for
when a database cannot be opened because it needs rollback
recovery but is read-only.
* Added SQL functions unicode(A) and char(X1,...,XN).
* Performance improvements for PRAGMA incremental_vacuum,
especially in cases where the number of free pages is greater
than what will fit on a single trunk page of the freelist.
* Improved optimization of queries containing aggregate min() or
max().
* Enhance virtual tables so that they can potentially use an
index when the WHERE clause contains the IN operator.
* Allow indices to be used for sorting even if prior terms of
the index are constrained by IN operators in the WHERE clause.
* Enhance the PRAGMA table_info command so that the "pk" column
is an increasing integer to show the order of columns in the
primary key.
* Enhance the query optimizer to exploit transitive join
constraints.
* Performance improvements in the query optimizer.
* Allow the error message from PRAGMA integrity_check to be
longer than 20000 bytes.
* Improved name resolution for deeply nested queries.
* Added the test_regexp.c module as a demonstration of how to
implement the REGEXP operator.
* Improved error messages in the RTREE extension.
* Enhance the command-line shell so that a non-zero argument to