In branch postgresql/master: SELECT SUM(SUM(a)) OVER () FROM (SELECT NULL::int4 AS a WHERE FALSE) R;
ERROR: XX000: cannot extract attribute from empty tuple slot Honestly, I'm not sure what the semantics of that are supposed to be. Is it even allowed by the standard? Regards, Jeff Davis -- Sent via pgsql-bugs mailing list (pgsql-bugs@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-bugs