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