Horton

Re: ERROR: XX000: could not find memoization table entry (reproducible)

Emmanuel Touzery <emmanuel.touzery@plandela.si>

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From: Emmanuel Touzery <emmanuel.touzery@plandela.si>
To: David Rowley <dgrowleyml@gmail.com>
Cc: "pgsql-bugs@lists.postgresql.org" <pgsql-bugs@lists.postgresql.org>
Date: 2025-10-23T06:30:22Z
Lists: pgsql-bugs

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  1. Fix incorrect zero extension of Datum in JIT tuple deform code

Hello,

 that's great news! Thank you!

 Maybe just a followup question: will the fix also be included in upcoming postgresql 17 minor releases? Seeing that it's not only PG18 that's affected.

 Thank you again!

Emmanuel

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Emmanuel Touzery
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________________________________
From: David Rowley <dgrowleyml@gmail.com>
Sent: Thursday, October 23, 2025 2:20 AM
To: Emmanuel Touzery <emmanuel.touzery@plandela.si>
Cc: pgsql-bugs@lists.postgresql.org <pgsql-bugs@lists.postgresql.org>
Subject: Re: ERROR: XX000: could not find memoization table entry (reproducible)

On Thu, 23 Oct 2025 at 10:13, David Rowley <dgrowleyml@gmail.com> wrote:
> The patch for the 1-liner.

I've pushed the fix for this [1]. The only other instance I saw of
LLVMBuildZExt for TypeDatum is in llvmjit_expr.c for "case
EEOP_BOOL_NOT_STEP". I didn't adjust this as it wasn't clear to me
that it was a problem. I expect the value being zero extended there is
either a 0 or 1, so didn't want to risk touching that code if it isn't
broken.


Emmanuel,

You should be seeing it in the next minor releases due around
mid-November. In the meantime, I suggest turning off
jit_tuple_deforming.

Many thanks for reporting this and coming up with the steps and backup
to reproduce the issue.

David

[1] https://git.postgresql.org/gitweb/?p=postgresql.git;a=commit;h=10945148eec689cc114fe872d623c3c7c4f546e6

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