On 11 May 2012 15:57, Inanc Seylan <inanc.seylan@xxxxxxxxx> wrote: > Hi all, > > I have implemented a user-defined function in C that returns a boolean value > after some computation. Now I have a query Q such that when I specify the > function in the WHERE clause of Q, Q runs in 40 secs and if I don't use the > function it runs in 4 secs. Then I thought that my implementation of this > function could be slow; so I decided to write a very simple function that > just returns true without any computation. To my surprise, it also takes > around 40 seconds to run Q with the new very simple function. Does anybody > have a clue about what might be going wrong? Is that a VOLATILE, STABLE or IMMUTABLE function? What's the output of EXPLAIN ANALYZE? -- If you can't see the forest for the trees, Cut the trees and you'll see there is no forest. -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
