E.12.1. Migration to version 8.1.5

A dump/restore is not required for those running 8.1.X. However, if you are upgrading from a version earlier than 8.1.2, see the release notes for 8.1.2.

E.12.2. Changes

• 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)