Horton

Re: Memory-Bounded Hash Aggregation

Jeff Davis <pgsql@j-davis.com>

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From: Jeff Davis <pgsql@j-davis.com>
To: Tomas Vondra <tomas.vondra@2ndquadrant.com>, andres@anarazel.de
Cc: Taylor Vesely <tvesely@pivotal.io>, Adam Lee <ali@pivotal.io>, Melanie Plageman <mplageman@pivotal.io>, pgsql-hackers@postgresql.org
Date: 2019-12-05T20:55:51Z
Lists: pgsql-hackers 
On Thu, 2019-11-28 at 18:46 +0100, Tomas Vondra wrote:
> And it's not clear to me why we should remove part of the comment
> before
> TupleHashTableHash.

It looks like 5dfc1981 changed the signature of TupleHashTableHash
without updating the comment, so it doesn't really make sense any more.
I just updated the comment as a part of my patch, but it's not related.

Andres, comments? Maybe we can just commit a fix for that comment and
take it out of my patch.

Regards,
	Jeff Davis

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,