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help / color / mirror / Atom feedFrom: Alexander Lakhin <[email protected]>
To: Amit Langote <[email protected]>
To: Tomas Vondra <[email protected]>
Cc: Robert Haas <[email protected]>
Cc: Alvaro Herrera <[email protected]>
Cc: Andres Freund <[email protected]>
Cc: Daniel Gustafsson <[email protected]>
Cc: David Rowley <[email protected]>
Cc: PostgreSQL Hackers <[email protected]>
Cc: Thom Brown <[email protected]>
Cc: Tom Lane <[email protected]>
Subject: Re: generic plans and "initial" pruning
Date: Fri, 14 Feb 2025 23:00:00 +0200
Message-ID: <[email protected]> (raw)
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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 = tp1.a)
ON pt.a = tp1.a
WHEN MATCHED THEN DELETE;
which fails for me with segfault:
Program terminated with signal SIGSEGV, Segmentation fault.
#0 ExecInitMerge (mtstate=0x5a9b9fbccae0, estate=0x5a9b9fbcbe20) at nodeModifyTable.c:3680
3680 relationDesc = RelationGetDescr(resultRelInfo->ri_RelationDesc);
(gdb) bt
#0 ExecInitMerge (mtstate=0x5a9b9fbccae0, estate=0x5a9b9fbcbe20) at nodeModifyTable.c:3680
#1 0x00005a9b67e6dfb5 in ExecInitModifyTable (node=0x5a9b9fbd5858, estate=0x5a9b9fbcbe20, eflags=0) at
nodeModifyTable.c:4906
#2 0x00005a9b67e273f7 in ExecInitNode (node=0x5a9b9fbd5858, estate=0x5a9b9fbcbe20, eflags=0) at execProcnode.c:177
#3 0x00005a9b67e1b9d2 in InitPlan (queryDesc=0x5a9b9fbb9970, eflags=0) at execMain.c:1092
#4 0x00005a9b67e1a524 in standard_ExecutorStart (queryDesc=0x5a9b9fbb9970, eflags=0) at execMain.c:268
#5 0x00005a9b67e1a223 in ExecutorStart (queryDesc=0x5a9b9fbb9970, eflags=0) at execMain.c:142
...
starting from cbc127917.
(I've discovered this anomaly with SQLsmith.)
Best regards,
Alexander Lakhin
Neon (https://neon.tech)
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Subject: Re: generic plans and "initial" pruning
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