| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Peter Geoghegan <pg(at)bowt(dot)ie>, David Rowley <dgrowleyml(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: disfavoring unparameterized nested loops |
| Date: | 2021-06-22 11:13:31 |
| Message-ID: | CA+TgmoZ4UjQVRree+YjC3PyqjW0CbscjT1iz_x5r1uPmSQdB+g@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Mon, Jun 21, 2021 at 4:52 PM Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> I'm willing to take some flak if there's not an easy proof that the outer
> scan is single-row, but I don't think we should just up and change it
> for cases where there is.
I think that's a reasonable request. I'm not sure that I believe it's
100% necessary, but it's certainly an improvement on a technical
level, and given that the proposed change could impact quite a lot of
plans, it's fair to want to see some effort being put into mitigating
the possible downsides. Now, I'm not sure when I might have time to
actually try to do the work, which kind of sucks, but that's how it
goes sometimes.
--
Robert Haas
EDB: http://www.enterprisedb.com
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