Re: [Bizgres-general] A Guide to Constraint Exclusion

From: Greg Stark <gsstark(at)mit(dot)edu>
To: hannu(at)skype(dot)net
Cc: Simon Riggs <simon(at)2ndquadrant(dot)com>, bizgres-general(at)pgfoundry(dot)org, pgsql-hackers(at)postgresql(dot)org
Subject: Re: [Bizgres-general] A Guide to Constraint Exclusion
Date: 2005-07-14 19:30:11
Message-ID: 871x61xk1o.fsf@stark.xeocode.com
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Hannu Krosing <hannu(at)tm(dot)ee> writes:

> > It is not yet possible to specify that an inheritance parent has no
> > rows, and, if so, should always be excluded from the query.
>
> I think that a simple "CHECK(false)" constraint should be enough for
> this.

huh, that's clever.

> > CE checks are not made when the parent table is involved in a join.
>
> Is this also the case where parent table is inside subquery and that
> subquery is involved in a join?

I assume this is a TODO and just not in your first batch of work? It seems
like a pretty important piece eventually. Are there any fundamental
difficulties with handling joins eventually?

--
greg

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