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From: Amit Langote <amitlangote09@gmail.com>
Date: Fri, 7 Nov 2025 18:23:16 +0900
Message-ID: <CA+HiwqHe+qQ9BY3RSOqCN50bwWGve-QCoRJaDwhzpy_B91BC6A@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
Content-Type: multipart/mixed; boundary="00000000000046a5ff0642fdbc4f"
Archived-At: <https://www.postgresql.org/message-id/CA%2BHiwqHe%2BqQ9BY3RSOqCN50bwWGve-QCoRJaDwhzpy_B91BC6A%40mail.gmail.com>
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Hi,

On Fri, Nov 7, 2025 at 6:05=E2=80=AFPM Kirill Reshke <reshkekirill@gmail.co=
m> wrote:
> On Fri, 7 Nov 2025 at 11:02, Amit Langote <amitlangote09@gmail.com> wrote=
:
> >
> > On Thu, Nov 6, 2025 at 7:00=E2=80=AFPM Amit Langote <amitlangote09@gmai=
l.com> wrote:
> > > I looked at a few options, but none seem non-invasive enough for
> > > back-patching, apart from the first patch I posted. That one makes
> > > ExecInitModifyTable() not require a ctid to be present to set the roo=
t
> > > partitioned table=E2=80=99s ri_RowIdAttNo, except in the case of MERG=
E, which
> > > seems to need it. The corner case that triggers the internal error fo=
r
> > > UPDATE/DELETE doesn=E2=80=99t occur for MERGE now and likely won=E2=
=80=99t when
> > > foreign tables eventually gain MERGE support; don't mark my words
> > > though ;-).
> >
> > Well, OK, I just had not tried hard enough to see that the same error
> > happens for MERGE too.
> >
> > With my patch applied:
> > EXPLAIN VERBOSE MERGE INTO pt t USING (VALUES (1, 'x'::text)) AS s(a,
> > b) ON false WHEN MATCHED THEN UPDATE SET b =3D s.b;
> > ERROR:  could not find junk ctid column
> >
> > I have another idea: we can simply recognize the corner condition that
> > 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.
>
> HI!
>
> 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.

--=20
Thanks, Amit Langote

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