| From: | Andres Freund <andres(at)anarazel(dot)de> |
|---|---|
| To: | David Fetter <david(at)fetter(dot)org> |
| Cc: | David Rowley <david(dot)rowley(at)2ndquadrant(dot)com>, Heikki Linnakangas <hlinnaka(at)iki(dot)fi>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>, Jeff Davis <pgsql(at)j-davis(dot)com> |
| Subject: | Re: Spilling hashed SetOps and aggregates to disk |
| Date: | 2018-06-05 17:19:03 |
| Message-ID: | 20180605171903.msx2swc6dsoljdtk@alap3.anarazel.de |
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| Lists: | pgsql-hackers |
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(at)anarazel(dot)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
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