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: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Imai Yoshikazu <yoshikazu_i443@live.jp>, "jesper.pedersen@redhat.com" <jesper.pedersen@redhat.com>, "Imai, Yoshikazu" <imai.yoshikazu@jp.fujitsu.com>, "'Amit Langote'" <amitlangote09@gmail.com>, David Rowley <david.rowley@2ndquadrant.com>, Alvaro Herrera <alvherre@2ndquadrant.com>, Robert Haas <robertmhaas@gmail.com>, Justin Pryzby <pryzby@telsasoft.com>, Pg Hackers <pgsql-hackers@postgresql.org>
Date: 2019-03-27T04:50:59Z
Lists: pgsql-hackers 
On 2019/03/27 12:06, Amit Langote wrote:
> I wonder if I should rework inherit.c so that its internal interfaces
> don't pass around parent Relation, but make do with the RelOptInfo?  I'll
> need to add tupdesc and reltype fields to RelOptInfo to go ahead with that
> though.

To give more context on the last sentence, the only place we need the
TupleDesc for is make_inh_translation_list().  Maybe, instead of adding
tupdesc to RelOptInfo, we could add a List of Vars of all attributes of a
table.  To avoid the overhead of always setting it, maybe we could set it
only for inheritance parent tables.  Adding tupdesc to RelOptInfo might be
a hard sell to begin with, because it would need to be pinned and then
released at the end of planning.

I'll see if I can make this work.

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.