| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Laurenz Albe <laurenz(dot)albe(at)cybertec(dot)at> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, David Rowley <dgrowleyml(at)gmail(dot)com>, 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: | 2024-10-02 14:08:50 |
| Message-ID: | CA+Tgmob=BuOyoiUtGYs=XVWTiXpDKDQwRTXtckp+Bysic2sT7g@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Fri, Sep 27, 2024 at 4:42 AM Laurenz Albe <laurenz(dot)albe(at)cybertec(dot)at> wrote:
> 1. The "disabled nodes" are always displayed.
> I'd be happier if it were only shown for COSTS ON, but I think it
> would be best if they were only shown with VERBOSE ON.
>
> After all, the messages are pretty verbose...
I agree that the messages are more verbose than what we did before
(add a large value to the cost). But I would have thought it wouldn't
matter much because most of the time nothing will be disabled. And I
would think if you get a plan that has some nodes disabled, you would
want to know about that.
I actually thought it was rather nice that this system lets you show
the disabled-nodes information even when COSTS OFF. Regression tests
need to suppress costs because it can vary by platform, but the count
of disabled nodes is stable enough to display.
--
Robert Haas
EDB: http://www.enterprisedb.com
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