Horton

Re: multi-column index

Manfred Koizar <mkoi-pg@aon.at>

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From: Manfred Koizar <mkoi-pg@aon.at>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: David Brown <time@bigpond.net.au>, Josh Berkus <pgsql-performance@postgresql.org>
Date: 2005-03-17T08:51:36Z
Lists: pgsql-performance 
On Wed, 16 Mar 2005 22:19:13 -0500, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>calculate the correlation explicitly for each index

May be it's time to revisit an old proposal that has failed to catch
anybody's attention during the 7.4 beta period:
http://archives.postgresql.org/pgsql-hackers/2003-08/msg00937.php

I'm not sure I'd store index correlation in a separate table today.
You've invented something better for functional index statistics, AFAIR.

Servus
 Manfred