Re: ANALYZE sampling is too good

From: Peter Geoghegan <pg(at)heroku(dot)com>
To: Jeff Janes <jeff(dot)janes(at)gmail(dot)com>
Cc: Robert Haas <robertmhaas(at)gmail(dot)com>, Greg Stark <stark(at)mit(dot)edu>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: ANALYZE sampling is too good
Date: 2013-12-09 21:40:16
Message-ID: CAM3SWZQhLXwESXuRajUPssGSn0anvp06fqDpS3Y97cbzeC14gQ@mail.gmail.com
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On Mon, Dec 9, 2013 at 1:18 PM, Jeff Janes <jeff(dot)janes(at)gmail(dot)com> wrote:
> I don't recall ever tracing a bad plan down to a bad n_distinct.

It does happen. I've seen it several times.

--
Peter Geoghegan

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