This release contains fixes from 7.4.17.
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.
Prevent index corruption when a transaction inserts rows and
then aborts close to the end of a concurrent VACUUM
on the same table (Tom)
Make CREATE DOMAIN ... DEFAULT NULL work properly (Tom)
Fix excessive logging of SSL error messages (Tom)
Fix crash when log_min_error_statement logging runs out
of memory (Tom)
Prevent CLUSTER from failing
due to attempting to process temporary tables of other sessions (Alvaro)
Require non-superusers who use /contrib/dblink to use only
password authentication, as a security measure (Joe)
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