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In-Reply-To: 
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From: Richard Guo <guofenglinux@gmail.com>
Date: Thu, 2 Oct 2025 10:13:48 +0900
Message-ID: 
 <CAMbWs4_v2P2hWbENT8UZG-t_A9TuPGJYas29FUcqx9EoETG6Gg@mail.gmail.com>
Subject: Re: Eager aggregation, take 3
To: Matheus Alcantara <matheusssilv97@gmail.com>
Cc: Robert Haas <robertmhaas@gmail.com>, Tom Lane <tgl@sss.pgh.pa.us>,
	Tender Wang <tndrwang@gmail.com>, Paul George <p.a.george19@gmail.com>,
	Andy Fan <zhihuifan1213@163.com>,
	PostgreSQL-development <pgsql-hackers@postgresql.org>,
 pgsql-hackers@lists.postgresql.org
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On Thu, Oct 2, 2025 at 8:55=E2=80=AFAM Matheus Alcantara
<matheusssilv97@gmail.com> wrote:
> The query 31 seems bad, I don't know if I'm doing something completely
> wrong but I've just setup a TPC-DS database and then executed the query
> on master and with the v23 patch and I got these results:
>
> Master:
>     Planning Time: 3.191 ms
>     Execution Time: 16950.619 ms
>
> Patch:
>     Planning Time: 3.257 ms
>     Execution Time: 3848355.646 ms

Thanks for reporting this.  It does seem odd.  I checked the TPC-DS
benchmarking on v13 and found that the execution time for query 31,
with and without eager aggregation, is as follows:

       EAGER-AGG-OFF           EAGER-AGG-ON
q31     10463.536 ms            10244.175 ms

There appears to be a regression between v13 and v23.  Looking into
it...

- Richard