| From: | Richard Guo <guofenglinux(at)gmail(dot)com> |
|---|---|
| To: | Dean Rasheed <dean(dot)a(dot)rasheed(at)gmail(dot)com> |
| Cc: | David Rowley <dgrowleyml(at)gmail(dot)com>, Ronan Dunklau <ronan(dot)dunklau(at)aiven(dot)io>, Justin Pryzby <pryzby(at)telsasoft(dot)com>, Pavel Luzanov <p(dot)luzanov(at)postgrespro(dot)ru>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, pgsql-hackers(at)lists(dot)postgresql(dot)org, Ranier Vilela <ranier(dot)vf(at)gmail(dot)com> |
| Subject: | Re: Add proper planner support for ORDER BY / DISTINCT aggregates |
| Date: | 2023-01-11 02:45:51 |
| Message-ID: | CAMbWs49sa00xmyw9TfHLYDsHhsud_YEUm3YRkEE4tJrUDqLCgQ@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Tue, Jan 10, 2023 at 6:12 PM Dean Rasheed <dean(dot)a(dot)rasheed(at)gmail(dot)com>
wrote:
> While doing some random testing, I noticed that the following is broken in
> HEAD:
>
> SELECT COUNT(DISTINCT random()) FROM generate_series(1,10);
>
> ERROR: ORDER/GROUP BY expression not found in targetlist
>
> It appears to have been broken by 1349d279, though I haven't looked at
> the details.
Yeah, this is definitely broken. For this query, we try to sort the
scan/join path by random() before performing the Aggregate, which is an
optimization implemented in 1349d2790b. However the scan/join plan's
tlist does not contain random(), which I think we need to fix.
Thanks
Richard
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