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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.
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Fix core dump when an untyped literal is taken as ANYARRAY
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Fix core dump in duration logging for extended query protocol when a COMMIT or ROLLBACK is executed
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Fix mishandling of AFTER triggers when query contains a SQL function returning multiple rows (Tom)
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Fix ALTER TABLE ... TYPE to recheck NOT NULL for USING clause (Tom)
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Fix string_to_array()
to handle overlapping matches for the separator string
For example, string_to_array('123xx456xxx789', 'xx').
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Fix to_timestamp()
for AM/PM formats (Bruce)
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Fix autovacuum's calculation that decides whether ANALYZE is needed (Alvaro)
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Fix corner cases in pattern matching for psql's \d commands
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Fix index-corrupting bugs in /contrib/ltree (Teodor)
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Numerous robustness fixes in ecpg (Joachim Wieland)
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Fix backslash escaping in /contrib/dbmirror
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Minor fixes in /contrib/dblink and /contrib/tsearch2
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Efficiency improvements in hash tables and bitmap index scans (Tom)
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Fix instability of statistics collection on Win32 (Tom, Andrew)
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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.
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Fixes for MSVC and Borland C++ compilers (Hiroshi Saito)
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Fixes for AIX and Intel compilers (Tom)