Horton

RE: speeding up planning with partitions

Imai, Yoshikazu <imai.yoshikazu@jp.fujitsu.com>

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From: "Imai, Yoshikazu" <imai.yoshikazu@jp.fujitsu.com>
To: "Tsunakawa, Takayuki" <tsunakawa.takay@jp.fujitsu.com>
Cc: 'Amit Langote' <Langote_Amit_f8@lab.ntt.co.jp>, David Rowley <david.rowley@2ndquadrant.com>, Alvaro Herrera <alvherre@2ndquadrant.com>, "Pg Hackers" <pgsql-hackers@postgresql.org>
Date: 2019-02-08T01:34:13Z
Lists: pgsql-hackers 
Tsunakawa-san,

On Wed, Feb 6, 2019 at 2:04 AM, Tsunakawa, Takayuki wrote:
> Can you compare the performance of auto and force_custom_plan again with
> the attached patch?  It uses PGPROC's LOCALLOCK list instead of the hash
> table.

Thanks for the patch, but it seems to have some problems.
When I executed create/drop/select commands to large partitions, like over than 512 partitions, backend died unexpectedly. Since I could see the difference of the performance of auto and force_custom_plan when partitions is large, patch needs to be modified to check whether performance is improved or not.

Thanks
--
Yoshikazu Imai

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.