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Re: Rewrite, normal execution vs. EXPLAIN ANALYZE

From: Marko Tiikkaja <marko(dot)tiikkaja(at)cs(dot)helsinki(dot)fi>
To: Robert Haas <robertmhaas(at)gmail(dot)com>
Cc: Alvaro Herrera <alvherre(at)commandprompt(dot)com>, David Fetter <david(at)fetter(dot)org>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Rewrite, normal execution vs. EXPLAIN ANALYZE
Date: 2010-07-24 09:44:11
Message-ID: 4C4AB5EB.9080309@cs.helsinki.fi (view raw or flat)
Thread:
Lists: pgsql-hackers
On 7/24/2010 1:43 AM, Robert Haas wrote:
> On Fri, Jul 23, 2010 at 6:20 PM, Alvaro Herrera
> <alvherre(at)commandprompt(dot)com>  wrote:
>> It seems like it's EXPLAIN ANALYZE that needs fixing.
>
> I would suggest that if we're going to change this, we back-patch it
> to 9.0 before beta4.

I did some digging and found the commit that changed the behaviour:
http://archives.postgresql.org/pgsql-committers/2004-09/msg00155.php and 
then later Tom fixed a bug in it: 
http://archives.postgresql.org/pgsql-committers/2005-10/msg00316.php

According to the latter commit, not updating the snapshot could be 
preferable for EXPLAIN ANALYZE, but I don't see why this is.  Maybe we 
should wait until we hear from Tom?


Regards,
Marko Tiikkaja

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