On Jun 12, 2010, at 14:57 , Tom Lane wrote: > But actually, there's another issue here: hstore defines not one but > three => operators: > > text => text yields hstore (with 1 element) > text[] => text[] yields hstore (with N elements) > hstore => text[] yields hstore (subset) > > It's reasonable to say that the first two are bad design, but I'm > a bit less willing to say that the last one is. What shall we > do with that?
Hm, the last one seems to be more akin to hstore - text yields hstore (key removed) hstore - text[] yields hstore (keys in array removed) hstore - hstore yields hstore (keys in hstore removed) since it's not a constructor like the first two, but rather an (intersection-like) operation on an existing hstore. Inspired by the already existing hstore ?& text[] yields boolean (true if set of keys subset of array) I suggest hstore & text[] as a replacement. best regards, Florian Pflug -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers