On Thu, Dec 14, 2017 at 4:01 PM, Ashutosh Bapat <ashutosh.ba...@enterprisedb.com> wrote: > > + > +EXPLAIN (COSTS OFF) > +SELECT a FROM pagg_tab GROUP BY a ORDER BY 1; > + QUERY PLAN > +------------------------------------------------- > + Group > + Group Key: pagg_tab_p1.a > + -> Merge Append > + Sort Key: pagg_tab_p1.a > + -> Group > + Group Key: pagg_tab_p1.a > + -> Sort > + Sort Key: pagg_tab_p1.a > + -> Seq Scan on pagg_tab_p1 > [ ... clipped ... ] > +(19 rows) > > It's strange that we do not annotate partial grouping as Partial. Does not > look > like a bug in your patch. Do we get similar output with parallel grouping?
I am wrong here. It's not partial grouping. It's two level grouping. I think annotating Group as Partial would be misleading. Sorry. -- Best Wishes, Ashutosh Bapat EnterpriseDB Corporation The Postgres Database Company
