"Tatsuhito Kasahara" <kasahara(dot)tatsuhito(at)oss(dot)ntt(dot)co(dot)jp> writes:
> PostgreSQL version: 8.1.11
> Description: "IS NOT NULL (IS NULL)" return wrong answer even where
> all fields are NULL(or NOT NULL).
> I think following fix is related..
> http://archives.postgresql.org/pgsql-committers/2006-09/msg00439.php
Yup, it is. Why are you reporting this?
regards, tom lane