Horton

Re: speeding up planning with partitions

Alvaro Herrera <alvherre@2ndquadrant.com>

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From: Alvaro Herrera <alvherre@2ndquadrant.com>
To: "Imai, Yoshikazu" <imai.yoshikazu@jp.fujitsu.com>
Cc: 'Amit Langote' <Langote_Amit_f8@lab.ntt.co.jp>, David Rowley <david.rowley@2ndquadrant.com>, Amit Langote <amitlangote09@gmail.com>, Pg Hackers <pgsql-hackers@postgresql.org>
Date: 2019-01-30T03:25:53Z
Lists: pgsql-hackers 
On 2019-Jan-30, Imai, Yoshikazu wrote:

> Why I did these tests is that I wanted to confirm that even if we
> apply each patch one by one, there's no performance problem. Because
> patches are quite large, I just felt it might be difficult to commit
> these patches all at once and I thought committing patch one by one
> would be another option to commit these patches. I don't know there is
> the rule in the community how patches should be committed, and if
> there, my thoughts above may be bad.

There are no absolute rules, but if I was committing it, I would
certainly commit each separately, mostly because reviewing the whole
series at once looks daunting ... and given the proposed commit
messages, I'd guess that writing a combined commit message would also be
very difficult.

So thanks for doing these tests.

-- 
Álvaro Herrera                https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, 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.