> Emphasis on "always". If the result of the function, given the same
> argument values, can be different after a SET, then it doesn't qualify
> for immutability. At least, that's my understanding.
Hmmmm. But within the context of the query plan itself, the results of
that expression are going to be constant. That is, for a given query
execution, it's always going to be the same comparison.
So this goes back to my original assertion that CE can't be fixed ...
--
Josh Berkus
PostgreSQL Experts Inc.
http://pgexperts.com