| From: | Jelte Fennema-Nio <postgres(at)jeltef(dot)nl> |
|---|---|
| To: | Bruce Momjian <bruce(at)momjian(dot)us> |
| Cc: | "Fujii(dot)Yuki(at)df(dot)MitsubishiElectric(dot)co(dot)jp" <Fujii(dot)Yuki(at)df(dot)mitsubishielectric(dot)co(dot)jp>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Robert Haas <robertmhaas(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Stephen Frost <sfrost(at)snowman(dot)net>, Andres Freund <andres(at)anarazel(dot)de>, Tomas Vondra <tomas(dot)vondra(at)enterprisedb(dot)com>, Julien Rouhaud <rjuju123(at)gmail(dot)com>, Daniel Gustafsson <daniel(at)yesql(dot)se>, vignesh C <vignesh21(at)gmail(dot)com>, Alexander Pyhalov <a(dot)pyhalov(at)postgrespro(dot)ru> |
| Subject: | Re: Partial aggregates pushdown |
| Date: | 2024-08-20 17:03:56 |
| Message-ID: | CAGECzQTx5Ofe8zHXgQHn5cKwaydqHOK8qdWvDyyBPCTnEfvUvw@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Tue, 20 Aug 2024 at 18:50, Bruce Momjian <bruce(at)momjian(dot)us> wrote:
> Okay, so we can do MAX easily, and AVG if the count can be represented
> as the same data type as the sum? Is that correct? Our only problem is
> that something like AVG(interval) can't use an array because arrays have
> to have the same data type for all array elements, and an interval can't
> represent a count?
Close, but still not completely correct. AVG(bigint) can also not be
supported by patch 1, because the sum and the count for that both
stored using an int128. So we'd need an array of int128, and there's
currently no int128 SQL type.
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