Disallow aggregate functions in UPDATE commands, except within sub-SELECTs (Tom)

The behavior of such an aggregate was unpredictable, and in 8.1.X could cause a crash, so it has been disabled. The SQL standard does not allow this either.

Fix core dump when an untyped literal is taken as ANYARRAY

Fix core dump in duration logging for extended query protocol when a COMMIT or ROLLBACK is executed

Fix mishandling of AFTER triggers when query contains a SQL function returning multiple rows (Tom)

Fix ALTER TABLE ... TYPE to recheck NOT NULL for USING clause (Tom)

Fix string_to_array() to handle overlapping matches for the separator string

For example, string_to_array('123xx456xxx789', 'xx').

Fix to_timestamp() for AM/PM formats (Bruce)

Fix autovacuum's calculation that decides whether ANALYZE is needed (Alvaro)

Fix corner cases in pattern matching for psql's \d commands

Fix index-corrupting bugs in /contrib/ltree (Teodor)

Numerous robustness fixes in ecpg (Joachim Wieland)

Fix backslash escaping in /contrib/dbmirror

Minor fixes in /contrib/dblink and /contrib/tsearch2

Efficiency improvements in hash tables and bitmap index scans (Tom)

Fix instability of statistics collection on Windows (Tom, Andrew)

Fix statement_timeout to use the proper units on Win32 (Bruce)

In previous Win32 8.1.X versions, the delay was off by a factor of 100.

Fixes for MSVC and Borland C++ compilers (Hiroshi Saito)

Fixes for AIX and Intel compilers (Tom)

Fix rare bug in continuous archiving (Tom)