On Thu, Dec 14, 2017 at 4:01 PM, Ashutosh Bapat
<ashutosh.bapat@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
