Horton

Re: GatherMerge misses to push target list

Amit Kapila <amit.kapila16@gmail.com>

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From: Amit Kapila <amit.kapila16@gmail.com>
To: pgsql-hackers <pgsql-hackers@postgresql.org>
Date: 2017-09-12T02:31:47Z
Lists: pgsql-hackers 
On Wed, Sep 6, 2017 at 10:04 AM, Amit Kapila <amit.kapila16@gmail.com> wrote:
> During my recent work on costing of parallel paths [1], I noticed that
> we are missing to push target list below GatherMerge in some simple
> cases like below.
>

I think this should be considered as a bug-fix for 10.0, but it
doesn't block any functionality or give wrong results, so we might
consider it as an optimization for GatherMerge.   In any case, I have
added this to next CF.

-- 
With Regards,
Amit Kapila.
EnterpriseDB: http://www.enterprisedb.com

Commits

  1. Push target list evaluation through Gather Merge.