Re: Planner misestimation for JOIN with VARCHAR

From: Michael Lewis <mlewis(at)entrata(dot)com>
To: David Rowley <dgrowleyml(at)gmail(dot)com>
Cc: Sebastian Dressler <sebastian(at)swarm64(dot)com>, "pgsql-general(at)postgresql(dot)org" <pgsql-general(at)postgresql(dot)org>
Subject: Re: Planner misestimation for JOIN with VARCHAR
Date: 2020-06-09 21:05:05
Message-ID: CAHOFxGq8JefZXOA7_QLbNKMLiXusP0B1E4rrwHb-gh53cLrG7Q@mail.gmail.com
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>
> the join selectivity functions have yet to learn about extended statistics.
>

That is very interesting to me. So, extended statistics would help to
properly estimate the result set coming out of a single table when
comparing each of those columns to one or many values, but not when joining
up another table? Is that on a roadmap or in progress as far as you know?

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