Re: Failed Assert in pgstat_assoc_relation

Hi,

On 2022-11-28 16:33:20 -0500, Tom Lane wrote:
> Andres Freund <andres(at)anarazel(dot)de> writes:
> > Something like the attached. Still needs a bit of polish, e.g. adding the test
> > case from above.
>
> > I'm a bit uncomfortable adding a function call below
> > * Perform swapping of the relcache entry contents. Within this
> > * process the old entry is momentarily invalid, so there *must* be no
> > * possibility of CHECK_FOR_INTERRUPTS within this sequence. Do it in
> > * all-in-line code for safety.
>
> Ugh. I don't know what pgstat_unlink_relation does, but assuming
> that it can never throw an error seems like a pretty bad idea,

I don't think it'd be an issue - it just resets the pointer from a pgstat
entry to the relcache entry.

But you're right:

> Can't that part be done outside the critical section?

we can do that. See the attached.

Do we have any cases of relcache entries changing their relkind?

Greetings,

Andres Freund