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References: <19099-e05dcfa022fe553d@postgresql.org> <CACJufxF9FcuYe8XOuWLgWK77HCUHpOc6+7+NkktFFNmzw15jKg@mail.gmail.com>
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In-Reply-To: <CA+HiwqHe+qQ9BY3RSOqCN50bwWGve-QCoRJaDwhzpy_B91BC6A@mail.gmail.com>
From: Amit Langote <amitlangote09@gmail.com>
Date: Sat, 8 Nov 2025 14:19:36 +0900
Message-ID: <CA+HiwqHt=b5GozQ-Z0Hnmdnbw7N1wyFxKzJ3Z27A0pd6gjFxKQ@mail.gmail.com>
Subject: Re: BUG #19099: Conditional DELETE from partitioned table with
 non-updatable partition raises internal error
To: Kirill Reshke <reshkekirill@gmail.com>
Cc: David Rowley <dgrowleyml@gmail.com>, Tom Lane <tgl@sss.pgh.pa.us>, 
	Tender Wang <tndrwang@gmail.com>, jian he <jian.universality@gmail.com>, exclusion@gmail.com, 
	pgsql-bugs@lists.postgresql.org
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Archived-At: <https://www.postgresql.org/message-id/CA%2BHiwqHt%3Db5GozQ-Z0Hnmdnbw7N1wyFxKzJ3Z27A0pd6gjFxKQ%40mail.gmail.com>
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Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

On Fri, Nov 7, 2025 at 6:23=E2=80=AFPM Amit Langote <amitlangote09@gmail.co=
m> wrote:
> On Fri, Nov 7, 2025 at 6:05=E2=80=AFPM Kirill Reshke <reshkekirill@gmail.=
com> wrote:
> > On Fri, 7 Nov 2025 at 11:02, Amit Langote <amitlangote09@gmail.com> wro=
te:
> > > I have another idea: we can simply recognize the corner condition tha=
t
> > > throws this error in ExecInitModifyTable() by checking if
> > > ModifyTable.resultRelations contains only the root partitioned table.
> > > That can only happen for UPDATE, DELETE, or MERGE when all child
> > > relations were excluded.
> > >
> > > Patch doing that attached.  Added test cases to file_fdw's suite.
> >
> > I think this is an OK option for backpatching.  After v2 applied, I
> > found the behavior of DELETE and EXPLAIN DELETE consistent.
>
> Thanks for the comment.
>
> > The only
> > remaining issue is VERBOSE output difference with or without
> > enable_partition_pruning (which is v19+ issue to worry about),
> > correct?
>
> Yes, iff we are to do anything at all about the difference.
>
> > Also, should we add  COSTS OFF to EXPLAIN in the regression test? I
> > understand that costs should be always zero, but COSTS OFF is almost
> > everywhere is tests
>
> Yeah, a good call.
>
> v3 attached.

Attached v4 where I have updated the commit message to mention 86dc9005.

The bug doesn=E2=80=99t seem critical enough to rush the fix, so I=E2=80=99=
ll hold off
on committing it for next week=E2=80=99s release to leave room for further
comments.

--=20
Thanks, Amit Langote

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