> You may be thinking of the STABLE volatility level. It requires that > the results of the function are the same for the same inputs, within > the same transaction. Right. But CE will only pay attention to immutable values, not stable ones, AFAICT. -- Josh Berkus PostgreSQL Experts Inc. http://pgexperts.com -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance