Re: parallel aggregation - Numeric is unsupported?

On 22/03/2016 5:24 pm, "Pavel Stehule" <pavel.stehule@gmail.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.