Re: Allow a prosupport function to be attached to an aggregate

On 18/8/2026 16:35, Tom Lane wrote:
> David Rowley <dgrowleyml(at)gmail(dot)com> writes:
> So I think it's a must-fix. To put my money where my mouth is,
> here's a draft patch. (I could not resist the temptation to
> improve compute_common_attribute's existing error message,
> which pretty well sucks: it's useless in a context that's not
> showing you an accurate error pointer.)
Thank you for the patch. I agree that it is the right shape for v19, so
I assembled it into a small series.

- 0001 documents SupportRequestSimplifyAggref. This is the patch I sent
earlier, unchanged.
- 0002 is your patch, plus documentation and regression tests.

The documentation there provides the rationale for why CREATE/ALTER
AGGREGATE should be added in v.20.

Also, I'm not sure why pg_dump/upgrade has not been implemented. So, I
added an 'unsupported' clause into the docs - let's discuss it later or
correct me if such a feature can't be supported at all.

--
regards, Andrei Lepikhov