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: 'Amit Langote' <Langote_Amit_f8@lab.ntt.co.jp>
Cc: David Rowley <david.rowley@2ndquadrant.com>, Alvaro Herrera <alvherre@2ndquadrant.com>, Pg Hackers <pgsql-hackers@postgresql.org>
Date: 2019-01-21T00:45:18Z
Lists: pgsql-hackers 
Hi Amit-san,

On Wed, Jan 17, 2019 at 10:25 AM, Amit Langote wrote:
> Thank you Imai-san for testing.  Sorry it totally slipped my mind to reply to this email.

Thanks for replying and sorry for my late reply. I've been undertaking on-the-job training last week.

> Are you saying that, when using auto mode, all executions of the query
> starting from 7th are slower than the first 5 executions?  That is, the
> latency of creating and using a custom plan increases *after* a generic
> plan is created and discarded on the 6th execution of the query?  If so,
> that is inexplicable to me.

Yes. And it's also inexplicable to me.

I'll check if this fact is really correct by majoring the time of the
first 5 queries before generic plan is created and the other queries
after generic plan is created.

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.