On 2018-06-05 19:04:11 +0200, David Fetter wrote:
> On Tue, Jun 05, 2018 at 02:56:23PM +1200, David Rowley wrote:
> > On 5 June 2018 at 06:52, Andres Freund <andres@anarazel.de> wrote:
> > > That part has gotten a bit easier since, because we have serialize
> > > / deserialize operations for aggregates these days.
> >
> > True. Although not all built in aggregates have those defined.
>
> Just out of curiosity, which ones don't? As of
> 3f85c62d9e825eedd1315d249ef1ad793ca78ed4, pg_aggregate has both of
> those as NOT NULL.
That doesn't mean much. We commonly store 0 / InvalidOid for such things
in the catalog. Allows us to still map the tuples to structs (due to
fixed width).
Greetings,
Andres Freund