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.
Support explicit placement of the temporary-table schema within
search_path, and disable searching it for functions
and operators (Tom)
This is needed to allow a security-definer function to set a
truly secure value of search_path. Without it,
an unprivileged SQL user can use temporary objects to execute code
with the privileges of the security-definer function (CVE-2007-2138).
See CREATE FUNCTION for more information.
/contrib/tsearch2 crash fixes (Teodor)
Fix potential-data-corruption bug in how VACUUM FULL handles
UPDATE chains (Tom, Pavan Deolasee)
Fix PANIC during enlargement of a hash index (bug introduced in 7.4.15)
(Tom)
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