Horton

Re: Rewrite, normal execution vs. EXPLAIN ANALYZE

Marko Tiikkaja <marko.tiikkaja@cs.helsinki.fi>

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From: Marko Tiikkaja <marko.tiikkaja@cs.helsinki.fi>
To: Robert Haas <robertmhaas@gmail.com>
Cc: Alvaro Herrera <alvherre@commandprompt.com>, David Fetter <david@fetter.org>, pgsql-hackers <pgsql-hackers@postgresql.org>
Date: 2010-07-24T09:44:11Z
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@commandprompt.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