E.171. Release 7.4.6

Repair possible failure to update hint bits on disk

Under rare circumstances this oversight could lead to « could not access transaction status » failures, which qualifies it as a potential-data-loss bug.

Ensure that hashed outer join does not miss tuples

Very large left joins using a hash join plan could fail to output unmatched left-side rows given just the right data distribution.

Disallow running pg_ctl as root

This is to guard against any possible security issues.

Avoid using temp files in /tmp in make_oidjoins_check

This has been reported as a security issue, though it's hardly worthy of concern since there is no reason for non-developers to use this script anyway.

Prevent forced backend shutdown from re-emitting prior command result

In rare cases, a client might think that its last command had succeeded when it really had been aborted by forced database shutdown.

Repair bug in pg_stat_get_backend_idset

This could lead to misbehavior in some of the system-statistics views.

Fix small memory leak in postmaster

Fix « expected both swapped tables to have TOAST tables » bug

This could arise in cases such as CLUSTER after ALTER TABLE DROP COLUMN.

Prevent pg_ctl restart from adding -D multiple times

Fix problem with NULL values in GiST indexes

:: is no longer interpreted as a variable in an ECPG prepare statement