Re: BUG #18950: pgsql function that worked in Postgresql 16 does not return in Postgresql 17 - Mailing list pgsql-bugs

From Lowell Hought
Subject Re: BUG #18950: pgsql function that worked in Postgresql 16 does not return in Postgresql 17
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Msg-id CAJtAGPpeqrgKNHdWqr=uPu1_UwN_TAgUvN4cfcWOaRN8U+8zDA@mail.gmail.com
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In response to Re: BUG #18950: pgsql function that worked in Postgresql 16 does not return in Postgresql 17  (Lowell Hought <lowell.hought@gmail.com>)
Responses Re: BUG #18950: pgsql function that worked in Postgresql 16 does not return in Postgresql 17
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Changing that parameter had no effect on the version 17 instance.  The query itself produces results in a matter of a second or so, but the function still hangs and does not return.

Lowell

On Sat, Jun 7, 2025 at 9:59 PM Lowell Hought <lowell.hought@gmail.com> wrote:
Wait, I spoke too soon.  When I just ran the query I was on version 16.  Give me a moment to shut down 16 and fire up 17 and I will try it again.

Lowell

On Sat, Jun 7, 2025 at 9:57 PM Lowell Hought <lowell.hought@gmail.com> wrote:
Yes!  I just changed the parameter as  you suggested and the query returned as expected.
So I guess something changed between version 16 and version 17?  Perhaps the default for that setting?

Lowell

On Sat, Jun 7, 2025 at 9:08 PM Tom Lane <tgl@sss.pgh.pa.us> wrote:
Lowell Hought <lowell.hought@gmail.com> writes:
> If I run the query outside of the function it works as expected.  But the function never returns.

This isn't that surprising either: a query inside a function is
often translated into a "generic" plan that doesn't depend on
specific parameter values, typically sacrificing runtime to
avoid repeated planning.  Does it get any better if you do
"set plan_cache_mode = force_custom_plan" before running the
function?

                        regards, tom lane

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