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Re: Idea about estimating selectivity for single-column expressions

From: Greg Stark <gsstark(at)mit(dot)edu>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: pgsql-hackers(at)postgresql(dot)org
Subject: Re: Idea about estimating selectivity for single-column expressions
Date: 2009-08-19 18:48:23
Message-ID: 407d949e0908191148j2cb0025boe8bf8c95db941d0a@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-hackers
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?

-- 
greg
http://mit.edu/~gsstark/resume.pdf

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