Re: Synchronized scans

From: Michael Glaesemann <grzm(at)seespotcode(dot)net>
To: Heikki Linnakangas <heikki(at)enterprisedb(dot)com>
Cc: Alvaro Herrera <alvherre(at)commandprompt(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Patches <pgsql-patches(at)postgresql(dot)org>, Jeff Davis <pgsql(at)j-davis(dot)com>
Subject: Re: Synchronized scans
Date: 2007-06-04 22:19:54
Message-ID: E09C298D-6D54-415F-9C39-FC7A6BFF72AE@seespotcode.net
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On Jun 4, 2007, at 16:34 , Heikki Linnakangas wrote:

> LIMIT without ORDER BY is worse because it not only returns tuples
> in different order, but it can return different tuples altogether
> when you run it multiple times.

Wouldn't DISTINCT ON suffer from the same issue without ORDER BY?

Michael Glaesemann
grzm seespotcode net

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