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From: Tatsuro Yamada <yamatattsu@gmail.com>
Date: Wed, 11 Jun 2025 17:36:58 +0900
Message-ID: 
 <CAOKkKFvgjAwtUFKh3baZ7BcQ5u+wS_DO+2n7dh0un+19v_VOzQ@mail.gmail.com>
Subject: Re: Add enable_groupagg GUC parameter to control GroupAggregate usage
To: Ashutosh Bapat <ashutosh.bapat.oss@gmail.com>
Cc: pgsql-hackers@lists.postgresql.org
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Hi Ashtosh and hackers,


> >Some of those instances are for plan stability, all of which need not be
> replicated. But some of them explicitly test sort based grouping. For rest
> of them hash based plan seems to be the best one, so explicit
> enable_groupagg = false is not needed. We will need some test to test the
> switch though.
>
> Thanks for your advice. I'll create a regression test and send a new patch
> to -hackers in my next email.
>

I created a regression test to check the enable_groupagg parameter in
the new patch.
To ensure plan stability, I disabled parallel query by setting the
max_parallel_*
parameters to 0.

Any feedback is welcome.
Please see the attached file.

Thanks,
Tatsuro Yamada

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Content-Type: text/html; charset="UTF-8"
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<div dir=3D"ltr"><div class=3D"gmail_quote gmail_quote_container"><div>Hi A=
shtosh and hackers,<br></div><div>=C2=A0</div><blockquote class=3D"gmail_qu=
ote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,20=
4);padding-left:1ex"><div dir=3D"ltr">&gt;Some of those instances are for p=
lan stability, all of which need not be replicated. But some of them explic=
itly test sort based grouping. For rest of them hash based plan seems to be=
 the best one, so explicit enable_groupagg =3D false is not needed. We will=
 need some test to test the switch though.<br><br>Thanks for your advice. I=
&#39;ll create a regression test and send a new patch <br>to -hackers in my=
 next email.</div></blockquote><div><br></div><div>I created a regression t=
est to check the enable_groupagg parameter in<br>the new patch.<br>To ensur=
e plan stability, I disabled parallel query by setting the max_parallel_*=
=C2=A0</div><div>parameters to 0.<br><br>Any feedback is welcome.<br>Please=
 see the attached file.<br><br>Thanks,<br>Tatsuro Yamada<br></div><div>=C2=
=A0</div></div></div>

--0000000000000a6413063747b849--

--0000000000000a6414063747b84b
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	name="0001-Add-new-GUC-parameter-enable_groupagg-WIP-r2.patch"
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