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References: <CA+HiwqFpZ80UJKr4tZus4Omgg7YESzFXKSwSHRW2Ap2=XSVyUA@mail.gmail.com>
 <CA+HiwqH45ZCQkWoLzjOyS6bQ9QsF7yDCKVwiEUtB_RwPFwLmQg@mail.gmail.com>
 <CA+HiwqHRRFQN6yZ54fBydOTM6ncqZBCmewZ6n519RjRdDsO44g@mail.gmail.com>
 <54c35fb9-da3a-4754-ab8c-46ed0b612465@vondra.me> <CA+HiwqH8N-SxEB6SysEBsYNgV_KJs66k9Z2SNmqVzbBP-60yWg@mail.gmail.com>
 <684c70d7-180e-461d-9377-600c2db581ba@vondra.me> <CA+HiwqEmG9YCQvG6uux7sO=jKFSAW6hA4Ea-ymfD+JhJAe4PWQ@mail.gmail.com>
 <CA+HiwqE2FfJfH=siLiR3kJ13tmXZORAGTWsZc2r52o1_5BDv+g@mail.gmail.com>
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 <CA+HiwqHCcSoYfpMjFshaU1bj6NjreiDvMSDpVSeBmqk-kbWrPw@mail.gmail.com>
 <CA+HiwqHOejJk0_qMuM5g38h70hY_JvHMAKwnH3k=urfTXauPQA@mail.gmail.com>
 <CA+HiwqFsGKM82oaMby3VWYXf_XFpDAMeT+6SXgj-45HpTrS1dA@mail.gmail.com>
 <CA+HiwqFA5hUWYktt3VMh4zQOYMxqH-MpdX8eemfM+o-9dY-zbQ@mail.gmail.com>
 <CA+HiwqEn7bbUXaXO=SmUujBjJSHfS31cwQroHRBwT0sR=66bgg@mail.gmail.com> <e72c94d9-e5f9-4753-9bc1-69d72bd54b8a@gmail.com>
In-Reply-To: <e72c94d9-e5f9-4753-9bc1-69d72bd54b8a@gmail.com>
From: Amit Langote <amitlangote09@gmail.com>
Date: Sat, 15 Feb 2025 16:51:09 +0900
Message-ID: <CA+HiwqG=gZZCmpR5VMnXYCm0JDxH3dOwiPngnMLCYTj1unWh0w@mail.gmail.com>
Subject: Re: generic plans and "initial" pruning
To: Alexander Lakhin <exclusion@gmail.com>
Cc: Tomas Vondra <tomas@vondra.me>, Robert Haas <robertmhaas@gmail.com>, 
	Alvaro Herrera <alvherre@alvh.no-ip.org>, Andres Freund <andres@anarazel.de>, 
	Daniel Gustafsson <daniel@yesql.se>, David Rowley <dgrowleyml@gmail.com>, 
	PostgreSQL Hackers <pgsql-hackers@postgresql.org>, Thom Brown <thom@linux.com>, 
	Tom Lane <tgl@sss.pgh.pa.us>
Content-Type: multipart/mixed; boundary="000000000000ea1741062e298e39"
Archived-At: <https://www.postgresql.org/message-id/CA%2BHiwqG%3DgZZCmpR5VMnXYCm0JDxH3dOwiPngnMLCYTj1unWh0w%40mail.gmail.com>
Precedence: bulk

--000000000000ea1741062e298e39
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

Hi Alexander,

On Sat, Feb 15, 2025 at 6:00=E2=80=AFAM Alexander Lakhin <exclusion@gmail.c=
om> wrote:
>
> Hello Amit,
>
> 06.02.2025 04:35, Amit Langote wrote:
>
> I plan to push 0001 tomorrow, barring any objections.
>
>
> Please try the following script:
> CREATE TABLE pt (a int, b int) PARTITION BY range (a);
> CREATE TABLE tp1 PARTITION OF pt FOR VALUES FROM (1) TO (2);
> CREATE TABLE tp2 PARTITION OF pt FOR VALUES FROM (2) TO (3);
>
> MERGE INTO pt
> USING (SELECT pg_backend_pid() AS pid) AS q JOIN tp1 ON (q.pid =3D tp1.a)
> ON pt.a =3D tp1.a
> WHEN MATCHED THEN DELETE;
>
> which fails for me with segfault:
> Program terminated with signal SIGSEGV, Segmentation fault.
> #0  ExecInitMerge (mtstate=3D0x5a9b9fbccae0, estate=3D0x5a9b9fbcbe20) at =
nodeModifyTable.c:3680
> 3680                    relationDesc =3D RelationGetDescr(resultRelInfo->=
ri_RelationDesc);
> (gdb) bt
> #0  ExecInitMerge (mtstate=3D0x5a9b9fbccae0, estate=3D0x5a9b9fbcbe20) at =
nodeModifyTable.c:3680
> #1  0x00005a9b67e6dfb5 in ExecInitModifyTable (node=3D0x5a9b9fbd5858, est=
ate=3D0x5a9b9fbcbe20, eflags=3D0) at nodeModifyTable.c:4906
> #2  0x00005a9b67e273f7 in ExecInitNode (node=3D0x5a9b9fbd5858, estate=3D0=
x5a9b9fbcbe20, eflags=3D0) at execProcnode.c:177
> #3  0x00005a9b67e1b9d2 in InitPlan (queryDesc=3D0x5a9b9fbb9970, eflags=3D=
0) at execMain.c:1092
> #4  0x00005a9b67e1a524 in standard_ExecutorStart (queryDesc=3D0x5a9b9fbb9=
970, eflags=3D0) at execMain.c:268
> #5  0x00005a9b67e1a223 in ExecutorStart (queryDesc=3D0x5a9b9fbb9970, efla=
gs=3D0) at execMain.c:142
> ...
>
> starting from cbc127917.
>
> (I've discovered this anomaly with SQLsmith.)

Thanks! It looks like I missed updating the MERGE-related lists in ModifyTa=
ble.

I've attached a fix with a test added based on your example. I plan to
push this on Monday.

--=20
Thanks, Amit Langote

--000000000000ea1741062e298e39
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