From: | David Rowley <david(dot)rowley(at)2ndquadrant(dot)com> |
---|---|
To: | Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> |
Cc: | PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: parallel aggregation - Numeric is unsupported? |
Date: | 2016-03-22 05:28:47 |
Message-ID: | CAKJS1f-eW1=efgrqe9qgoP=ms=nrMXwx3x2Aa+9sYAc2hFJ86A@mail.gmail.com |
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Lists: | pgsql-hackers |
On 22/03/2016 5:24 pm, "Pavel Stehule" <pavel(dot)stehule(at)gmail(dot)com> wrote:
>
> Hi
>
> is it expected in this moment?
>
>
> Table "public.foo"
> Column │ Type │ Modifiers
> ════════╪═════════╪═══════════
> a │ integer │
>
> postgres=# \d foo2
> Table "public.foo2"
> Column │ Type │ Modifiers
> ════════╪═════════╪═══════════
> a │ numeric │
>
> postgres=# explain select sum(a) from foo;
> QUERY
PLAN
>
════════════════════════════════════════════════════════════════════════════════════════
> Finalize Aggregate (cost=76498.35..76498.36 rows=1 width=8)
> -> Gather (cost=76497.93..76498.34 rows=4 width=8)
> Number of Workers: 4
> -> Partial Aggregate (cost=75497.93..75497.94 rows=1 width=8)
> -> Parallel Seq Scan on foo (cost=0.00..69247.94
rows=2499994 width=4)
> (5 rows)
>
> postgres=# explain select sum(a) from foo2;
> QUERY PLAN
> ══════════════════════════════════════════════════════════════════════
> Aggregate (cost=179053.25..179053.26 rows=1 width=32)
> -> Seq Scan on foo2 (cost=0.00..154053.60 rows=9999860 width=12)
> (2 rows)
Yes. There's still a few outstanding patches to add support to serialize
internal states. See the combine aggregates thread.
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