Re: PoC: using sampling to estimate joins / complex conditions

From: Andres Freund <andres(at)anarazel(dot)de>
To: Tomas Vondra <tomas(dot)vondra(at)enterprisedb(dot)com>
Cc: PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>
Subject: Re: PoC: using sampling to estimate joins / complex conditions
Date: 2022-01-04 23:58:12
Message-ID: 20220104235812.xphxnk3uxpmauan6@alap3.anarazel.de
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Hi,

On 2021-06-27 19:55:24 +0200, Tomas Vondra wrote:
> estimating joins is one of the significant gaps related to extended
> statistics, and I've been regularly asked about what we might do about
> that. This is an early experimental patch that I think might help us
> with improving this, possible even in PG15.

The tests in this patch fail:
https://cirrus-ci.com/task/5304621299138560
https://api.cirrus-ci.com/v1/artifact/task/5304621299138560/regress_diffs/src/test/regress/regression.diffs

Looks like the regression test output hasn't been updated?

Greetings,

Andres Freund

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