Re: BUG #17564: Planner bug in combination of generate_series(), unnest() and ORDER BY

From: Richard Guo <guofenglinux(at)gmail(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Martijn van Oosterhout <kleptog(at)gmail(dot)com>, PostgreSQL mailing lists <pgsql-bugs(at)lists(dot)postgresql(dot)org>
Subject: Re: BUG #17564: Planner bug in combination of generate_series(), unnest() and ORDER BY
Date: 2022-08-04 03:16:42
Message-ID: CAMbWs49AAq1V18=n37qOmAdWOd0-Y=_Z6Wy1gWM2=FeqJWbrCQ@mail.gmail.com
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On Thu, Aug 4, 2022 at 9:55 AM Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:

> Richard Guo <guofenglinux(at)gmail(dot)com> writes:
> > I'm reproducing this bug in HEAD with the repro given by Martijn, but
> > with some additional GUC sets:
>
> > set enable_hashjoin to off;
> > set enable_mergejoin to off;
> > set enable_indexscan to off;
> > set enable_bitmapscan to off;
>
> Hm, does not work for me ... although I assume you mean bc76f5ac4
> or before? It should definitely not happen after 1aa8dad41,
> unless there's an additional bug ...

Yeah, I tested in bc76f5ac4. Attached is a regression test I composed.
I tested it locally and it can catch this bug before 1aa8dad41 and give
the expected answer after 1aa8dad41.

Thanks
Richard

Attachment Content-Type Size
v1-0001-Test-we-disallow-pushing-down-SRF-pathkeys.patch application/octet-stream 2.7 KB

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