2009/4/9 Teodor Sigaev <teo...@sigaev.ru>: > contains - all elements of second array are contained in the first one. > Empty array has no element, so it can't be contained.
That sounds wrong. A <contains> B should surely always be true if B is empty. ie "for all x, x in B implies x in A". Or put another way, "contains" just means "is a superset of" and all sets are supersets of the empty set (even the empty set). -- greg -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
