Re: Partition : Append node over a single SeqScan

On Wed, Jul 5, 2017 at 3:48 PM, Ashutosh Sharma <ashu(dot)coek88(at)gmail(dot)com> wrote:
> Hi All,
>
> Today while exploring a bit on Range table partitioning, I could see
> that even if scan is performed on a single partition, the plan node
> has Append node in it. Isn't it a bug?

No. See following comment from create_append_plan()
1045 /*
1046 * XXX ideally, if there's just one child, we'd not bother to
generate an
1047 * Append node but just return the single child. At the
moment this does
1048 * not work because the varno of the child scan plan won't match the
1049 * parent-rel Vars it'll be asked to emit.
1050 */

--
Best Wishes,
Ashutosh Bapat
EnterpriseDB Corporation
The Postgres Database Company