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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Simon Riggs <simon@2ndquadrant.com>
Cc: Kevin Grittner <Kevin.Grittner@wicourts.gov>
Cc: pgsql-performance@postgresql.org, Andreas Kretschmer <akretschmer@spamfence.net>
Subject: Re: BETWEEN optimizer problems with single-value
Date: Thu, 16 Mar 2006 14:45:34 -0500
Message-ID: <19304.1142538334@sss.pgh.pa.us> (raw)
In-Reply-To: <1142537298.3859.497.camel@localhost.localdomain>
References: <44180105.EE98.0025.0@wicourts.gov>
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	<44180D33.EE98.0025.0@wicourts.gov>
	<28798.1142450270@sss.pgh.pa.us>
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	<11428.1142474724@sss.pgh.pa.us>
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	<17043.1142524621@sss.pgh.pa.us>
	<1142537298.3859.497.camel@localhost.localdomain>

Simon Riggs <simon@2ndquadrant.com> writes:
> I was thinking that we would fill out the OpExpr with different
> opclasses for each plan, so each one sees a different story. (I was
> thinking there was a clauselist for each plan; if not, there could be.)

This is backwards: there isn't a plan yet.  If there were, having
clauselist_selectivity return different answers depending on what index
the plan was thinking of using would still be wrong.

> [BTW how do you add new indexes to system tables? I want to add one to
> pg_inherits but not sure where to look.]

src/include/catalog/indexing.h

Offhand I think adding a new entry is all you have to do.  You may also
want a syscache to go with it, which'll take a bit more work.

			regards, tom lane



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