Horton

Re: why not parallel seq scan for slow functions

Robert Haas <robertmhaas@gmail.com>

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From: Robert Haas <robertmhaas@gmail.com>
To: Amit Kapila <amit.kapila16@gmail.com>
Cc: Jeff Janes <jeff.janes@gmail.com>, Thomas Munro <thomas.munro@enterprisedb.com>, Amit Khandekar <amitdkhan.pg@gmail.com>, Dilip Kumar <dilipbalaut@gmail.com>, pgsql-hackers <pgsql-hackers@postgresql.org>
Date: 2017-11-08T11:04:09Z
Lists: pgsql-hackers 
On Tue, Nov 7, 2017 at 9:41 PM, Amit Kapila <amit.kapila16@gmail.com> wrote:
> This is required to prohibit generating gather path for top rel in
> case of inheritence (Append node) at this place (we want to generate
> it later when scan/join target is available).

OK, but why don't we want to generate it later when there isn't
inheritance involved?

-- 
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

Commits

  1. Rewrite the code that applies scan/join targets to paths.

  2. Teach create_projection_plan to omit projection where possible.

  3. Make the upper part of the planner work by generating and comparing Paths.