Horton

Re: speeding up planning with partitions

Tom Lane <tgl@sss.pgh.pa.us>

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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Amit Langote <amitlangote09@gmail.com>
Cc: Imai Yoshikazu <yoshikazu_i443@live.jp>, Amit Langote <Langote_Amit_f8@lab.ntt.co.jp>, David Rowley <david.rowley@2ndquadrant.com>, "jesper.pedersen@redhat.com" <jesper.pedersen@redhat.com>, "Imai, Yoshikazu" <imai.yoshikazu@jp.fujitsu.com>, Alvaro Herrera <alvherre@2ndquadrant.com>, Robert Haas <robertmhaas@gmail.com>, Justin Pryzby <pryzby@telsasoft.com>, Pg Hackers <pgsql-hackers@postgresql.org>
Date: 2019-03-31T18:46:51Z
Lists: pgsql-hackers

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One thing that I intentionally left out of the committed patch was changes
to stop short of scanning the whole simple_rel_array when looking only for
baserels.  I thought that had been done in a rather piecemeal fashion
and it'd be better to address it holistically, which I've now done in the
attached proposed patch.

This probably makes little if any difference in the test cases we've
mostly focused on in this thread, since there wouldn't be very many
otherrels anyway now that we don't create them for pruned partitions.
However, in a case where there's a lot of partitions that we can't prune,
this could be useful.

I have not done any performance testing to see if this is actually
worth the trouble, though.  Anybody want to do that?

			regards, tom lane

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.