Robert Haas <robertmhaas@gmail.com> writes:
> On Thu, Nov 14, 2013 at 12:28 AM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>>> 2) Allow foreign tables to have CHECK constraints
>>> Like NOT NULL, I think we don't need to enforce the check duroing
>>> INSERT/UPDATE against foreign table.
>> Really?
> I think it's been previously proposed that we have some version of a
> CHECK constraint that effectively acts as an assertion for query
> optimization purposes, but isn't actually enforced by the system. I
> can see that being useful in a variety of situations, including this
> one.
Yeah, I think it would be much smarter to provide a different syntax
to explicitly represent the notion that we're only assuming the condition
is true, and not trying to enforce it.
regards, tom lane