effective SELECT from child tables

From: "Ilia Kantor" <ilia(at)obnovlenie(dot)ru>
To: <pgsql-hackers(at)postgresql(dot)org>
Subject: effective SELECT from child tables
Date: 2005-09-27 17:30:55
Message-ID: auto-000571351417@umail.ru
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Let table A be inherited by A1, A2, A3.

How to select from A records where actual relations are A1, A2 ?

I found a way somewhere, it sounds like SELECT : WHERE tableoid IN (a1.oid,
a2.oid),

but tableoid checks actually do seq scan.

Like: SELECT * FROM sometable WHERE tableoid =anything will do seq. scan on
sometable..

So such way seems very ineffective: it seq scans and filters records..

Maybe new constraint_exclusion staff could help to exclude non-matching
tables from inheritance query ?

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