Hello it is not a bug - see http://archives.postgresql.org/pgsql-hackers/2009-07/msg01525.php
Regards Pavel Stehule 2012/6/20 <rikard.pave...@zg.htnet.hr>: > The following bug has been logged on the website: > > Bug reference: 6701 > Logged by: Rikard Pavelic > Email address: rikard.pave...@zg.htnet.hr > PostgreSQL version: 9.1.3 > Operating system: Windows 7 > Description: > > create type t AS (i int); > create type complex as (t t, i int); > create table bad(i int, c complex); > > insert into bad values(1, null); > insert into bad values(1, ROW(null, 2)); > insert into bad values(1, ROW(ROW(1), 2)); > > select * from bad; > select * from bad where c is null; > > --This doesn't work as expected > select * from bad where c is not null; > > --Fortunately a workaround > select * from bad where NOT c is null; > > > > -- > Sent via pgsql-bugs mailing list (pgsql-bugs@postgresql.org) > To make changes to your subscription: > http://www.postgresql.org/mailpref/pgsql-bugs -- Sent via pgsql-bugs mailing list (pgsql-bugs@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-bugs
