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This release contains one serious bug fix over 7.4.20.
For information about new features in the 7.4 major release, see
Section E.78.
A dump/restore is not required for those running 7.4.X.
However, if you are upgrading from a version earlier than 7.4.11,
see the release notes for 7.4.11.
Make pg_get_ruledef() parenthesize negative constants (Tom)
Before this fix, a negative constant in a view or rule might be dumped
as, say, -42::integer, which is subtly incorrect: it should
be (-42)::integer due to operator precedence rules.
Usually this would make little difference, but it could interact with
another recent patch to cause
PostgreSQL to reject what had been a valid
SELECT DISTINCT view query. Since this could result in
pg_dump output failing to reload, it is being treated
as a high-priority fix. The only released versions in which dump
output is actually incorrect are 8.3.1 and 8.2.7.
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