Re: On disable_cost

From: Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>
To: Robert Haas <robertmhaas(at)gmail(dot)com>
Cc: Alena Rybakina <a(dot)rybakina(at)postgrespro(dot)ru>, David Rowley <dgrowleyml(at)gmail(dot)com>, Laurenz Albe <laurenz(dot)albe(at)cybertec(dot)at>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Heikki Linnakangas <hlinnaka(at)iki(dot)fi>, Peter Geoghegan <pg(at)bowt(dot)ie>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>
Subject: Re: On disable_cost
Date: 2024-10-07 15:28:15
Message-ID: 202410071528.uw73kusf47tk@alvherre.pgsql
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On 2024-Oct-03, Robert Haas wrote:

> One general thing to think about is that we really document very
> little about EXPLAIN. That might not be good, but we should consider
> whether it will look strange if we document a bunch of stuff about
> this and still don't talk about anything else.

I completely agree that we document very little about EXPLAIN. However,
I disagree that we should continue to do so. I'd rather take the
opportunity to _add_ more details that we currently omit, and make the
documentation more complete. A short blurb about Disabled Nodes such as
the one Laurenz proposed seems an excellent way to start; we can add
more later, as people propose them. We don't have to stop here, and we
don't have to stay at statu quo re. other points.

--
Álvaro Herrera 48°01'N 7°57'E — https://www.EnterpriseDB.com/
Officer Krupke, what are we to do?
Gee, officer Krupke, Krup you! (West Side Story, "Gee, Officer Krupke")

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