Robert Haas <robertmh...@gmail.com> writes: > Random thought: would it be possible to use something like this to > optimize foreign key constraints, by not firing them if none of the > relevant columns have been updated?
There already is code in there to do that; see RI_FKey_keyequal_upd_fk and RI_FKey_keyequal_upd_pk. Earlier in the discussion of this patch I had suggested eliminating the special-case code for FKs in favor of using a WHEN clause, but that would probably not fly unless we can make the WHEN-based implementation just as fast as the bespoke code; which seems unlikely. regards, tom lane -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers