Re: BUG #19370: PG18 returns incorrect array slice results when slice bounds depend on another array expression

Andres Freund <andres@anarazel.de>

From: Andres Freund <andres@anarazel.de>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: David Rowley <dgrowleyml@gmail.com>, redraiment@gmail.com, pgsql-bugs@lists.postgresql.org
Date: 2026-01-07T01:04:15Z
Lists: pgsql-bugs
Hi,

On 2026-01-06 13:35:23 -0500, Tom Lane wrote:
> Andres Freund <andres@anarazel.de> writes:
> > On 2026-01-06 11:40:01 -0500, Tom Lane wrote:
> >> We could either generalize EEOP_PARAM_SET to include an explicit
> >> specification of the source value's address
> 
> > That's pretty trivial, see attached.  I don't quite understand why I didn't go
> > that way immediately...
> 
> Yeah, that looks about right.

Pushed, together with a narrowed down testcase.

Thanks for the report!  Without a reproducer this would have been much much
harder (*).

Greetings,

Andres Freund

* although I do wish we had something like cvise for sql...



Commits

  1. Fix buggy interaction between array subscripts and subplan params