Horton

Re: Memory-Bounded Hash Aggregation

Thomas Munro <thomas.munro@gmail.com>

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From: Thomas Munro <thomas.munro@gmail.com>
To: Peter Geoghegan <pg@bowt.ie>
Cc: Jeff Davis <pgsql@j-davis.com>, Heikki Linnakangas <hlinnaka@iki.fi>, Tomas Vondra <tomas.vondra@2ndquadrant.com>, Taylor Vesely <tvesely@pivotal.io>, Adam Lee <ali@pivotal.io>, Melanie Plageman <mplageman@pivotal.io>, PostgreSQL Hackers <pgsql-hackers@postgresql.org>
Date: 2020-02-04T23:53:27Z
Lists: pgsql-hackers 
On Wed, Feb 5, 2020 at 12:08 PM Peter Geoghegan <pg@bowt.ie> wrote:
> Parallel CREATE INDEX is currently accidentally disabled on the master
> branch. That should be fixed in the next couple of days. You can
> temporarily revert 74618e77 if you want to get it back for testing
> purposes today.

(Fixed -- sorry for the disruption.)

Commits

  1. Fix costing for disk-based hash aggregation.

  2. Fixes for Disk-based Hash Aggregation.

  3. Disk-based Hash Aggregation.

  4. Extend ExecBuildAggTrans() to support a NULL pointer check.

  5. Save calculated transitionSpace in Agg node.

  6. Minor refactor of nodeAgg.c.

  7. Logical Tape Set: lazily allocate read buffer.

  8. Introduce TupleHashTableHash() and LookupTupleHashEntryHash().

  9. Logical Tape Set: use min heap for freelist.

  10. Fix comments in execGrouping.c

  11. Avoid integer overflow while sifting-up a heap in tuplesort.c.

  12. Make the overflow guards in ExecChooseHashTableSize be more protective.

  13. Improve performance of our private version of qsort. Per recent testing,