Excerpts from Robert Haas's message of vie ago 17 15:44:29 -0400 2012: > On Fri, Aug 17, 2012 at 2:58 PM, Alvaro Herrera > <alvhe...@2ndquadrant.com> wrote: > > I mean, what are NOT NULL in foreign tables for? Are they harmed or > > helped by having pg_constraint rows? > > As I've mentioned when this has come up before, I think that > constraints on foreign tables should be viewed as declarative > statements about the contents of the foreign data that the DB will > assume true. This could be useful for a variety of purposes: > constraint exclusion, query optimization, etc.
So pg_constraint rows for NOT NULLs are a good thing, right? In general, it seems to me that you're saying we should just lift the DefineRelation-enforced restriction that foreign tables ought not to have constraints. So if the user wants to specify CREATE FOREIGN TABLE people ( who person CHECK (who IS OF TYPE 'human'), .. ) server foobar; we ought to let them. Correct? -- Álvaro Herrera http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training & Services -- Sent via pgsql-hackers mailing list (firstname.lastname@example.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers