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This release contains a variety of fixes from 7.4.9.
A dump/restore is not required for those running 7.4.X. However, if you are upgrading from a version earlier than 7.4.8, see the release notes for 7.4.8.
Fix race condition in transaction log management
There was a narrow window in which an I/O operation could be initiated for the wrong page, leading to an Assert failure or data corruption.
Prevent failure if client sends Bind protocol message when current transaction is already aborted
/contrib/ltree fixes (Teodor)
AIX and HPUX compile fixes (Tom)
Fix longstanding planning error for outer joins
This bug sometimes caused a bogus error "RIGHT JOIN is only supported with merge-joinable join conditions".
Prevent core dump in pg_autovacuum when a table has been dropped