Horton

Re: speeding up planning with partitions

David Rowley <david.rowley@2ndquadrant.com>

View thread View on postgr.es
From: David Rowley <david.rowley@2ndquadrant.com>
To: Amit Langote <Langote_Amit_f8@lab.ntt.co.jp>
Cc: Floris Van Nee <florisvannee@optiver.com>, Tom Lane <tgl@sss.pgh.pa.us>, Imai Yoshikazu <yoshikazu_i443@live.jp>, "jesper.pedersen@redhat.com" <jesper.pedersen@redhat.com>, "Imai, Yoshikazu" <imai.yoshikazu@jp.fujitsu.com>, Amit Langote <amitlangote09@gmail.com>, Alvaro Herrera <alvherre@2ndquadrant.com>, Robert Haas <robertmhaas@gmail.com>, Justin Pryzby <pryzby@telsasoft.com>, Pg Hackers <pgsql-hackers@postgresql.org>
Date: 2019-04-05T03:18:41Z
Lists: pgsql-hackers 
On Fri, 5 Apr 2019 at 16:09, Amit Langote <Langote_Amit_f8@lab.ntt.co.jp> wrote:
> Although, we still have ways
> to go in terms of scaling generic plan execution to larger partition
> counts, solution(s) for which have been proposed by David but haven't made
> it into master yet.

Is that a reference to the last paragraph in [1]?  That idea has not
gone beyond me writing that text yet! :-(   It was more of a passing
comment on the only way I could think of to solve the problem.

[1] https://www.postgresql.org/message-id/CAKJS1f-y1HQK+VjG7=C==vGcLnzxjN8ysD5NmaN8Wh4=VsYipw@mail.gmail.com

-- 
 David Rowley                   http://www.2ndQuadrant.com/
 PostgreSQL Development, 24x7 Support, Training & Services

Commits

  1. Clean up handling of constraint_exclusion and enable_partition_pruning.

  2. Add test case exercising formerly-unreached code in inheritance_planner.

  3. Speed up planning when partitions can be pruned at plan time.

  4. Avoid crash in partitionwise join planning under GEQO.

  5. Avoid passing query tlist around separately from root->processed_tlist.

  6. Build "other rels" of appendrel baserels in a separate step.

  7. Get rid of duplicate child RTE for a partitioned table.

  8. Rearrange make_partitionedrel_pruneinfo to avoid work when we can't prune.

  9. Don't copy PartitionBoundInfo in set_relation_partition_info.

  10. Move building of child base quals out into a new function

  11. Reorganize planner code moved in b60c39759908

  12. Move inheritance expansion code into its own file

  13. Fix inherited UPDATE/DELETE with UNION ALL subqueries.

  14. Rearrange planner to save the whole PlannerInfo (subroot) for a subquery.