Re: NOT NULL constraints in foreign tables

On Fri, Aug 17, 2012 at 2:58 PM, Alvaro Herrera
<alvherre@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.

-- 
Robert Haas
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