Re: Idea about estimating selectivity for single-column expressions

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Greg Stark <gsstark(at)mit(dot)edu>
Cc: pgsql-hackers(at)postgresql(dot)org
Subject: Re: Idea about estimating selectivity for single-column expressions
Date: 2009-08-19 18:51:18
Message-ID: 26982.1250707878@sss.pgh.pa.us
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Greg Stark <gsstark(at)mit(dot)edu> writes:
> On Wed, Aug 19, 2009 at 7:22 PM, Tom Lane<tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>> It may be that a subtransaction will actually be acceptable overhead,
>> as long as we don't go overboard and invoke this mechanism for "simple"
>> WHERE clauses. Hard to tell without coding it up and testing it though.

> Are you looking for volunteers? Or have you already nearly finished?

I have not started on it, and have a few other things on my plate first.
I was planning to do it, but if you'd like to try, be my guest.

regards, tom lane

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