Horton

Re: speeding up planning with partitions

Amit Langote <langote_amit_f8@lab.ntt.co.jp>

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From: Amit Langote <Langote_Amit_f8@lab.ntt.co.jp>
To: Amit Langote <amitlangote09@gmail.com>, David Rowley <david.rowley@2ndquadrant.com>
Cc: Alvaro Herrera <alvherre@2ndquadrant.com>, "Imai, Yoshikazu" <imai.yoshikazu@jp.fujitsu.com>, Pg Hackers <pgsql-hackers@postgresql.org>
Date: 2019-02-07T10:21:45Z
Lists: pgsql-hackers

Attachments

On 2019/02/02 22:52, Amit Langote wrote:
> Attached updated patches.
> 
> One big change is related to how ECs are transferred to child
> PlannerInfos.  As David suggested upthread, I created a block in
> adjust_appendrel_attrs_mutator that creates a translated copy of a
> given EC containing wherein the parent expression in the original
> ec_members list is replaced by the corresponding child expression.
> With that in place, we no longer need the changes to
> add_child_rel_equivalences().  Instead there's just:
> subroot->eq_classes = adjust_appendrel_attrs(root, root->eq_classes,
> ...), just as David described upthread.

Rebased over bdd9a99aac.

That commit fixes the bug that lateral_relids were not propagated to
grandchildren of an appendrel in some cases due to the way parent rels
were mapped to child rels in a nested loop over root->simple_rel_array and
root->append_rel_list.  The problem that was fixed with that commit was
not present with the patches here to begin with.  With the patch 0002
here, lateral_relids are propagated from parent rel to child rel directly
when the latter's RelOptInfo is built, so lateral_relids are properly
propagated from the (possibly RTE_SUBQUERY) top-most parent rel to all the
child rels.

Thanks,
Amit

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.