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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: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
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,

but tableoid checks actually do seq scan.


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


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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