Horton

Re: Default setting for enable_hashagg_disk

Jeff Davis <pgsql@j-davis.com>

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From: Jeff Davis <pgsql@j-davis.com>
To: Peter Geoghegan <pg@bowt.ie>, Alvaro Herrera <alvherre@2ndquadrant.com>
Cc: David Rowley <dgrowleyml@gmail.com>, Stephen Frost <sfrost@snowman.net>, Tom Lane <tgl@sss.pgh.pa.us>, Andres Freund <andres@anarazel.de>, Bruce Momjian <bruce@momjian.us>, Robert Haas <robertmhaas@gmail.com>, Justin Pryzby <pryzby@telsasoft.com>, Melanie Plageman <melanieplageman@gmail.com>, Tomas Vondra <tomas.vondra@2ndquadrant.com>, "pgsql-hackers@postgresql.org" <pgsql-hackers@postgresql.org>
Date: 2020-07-18T00:13:15Z
Lists: pgsql-hackers, pgsql-docs 
On Tue, 2020-07-14 at 21:12 -0700, Peter Geoghegan wrote:
> Attached is a WIP patch implementing hash_mem_multiplier, with 1.0 as
> the GUC's default value (i.e. the patch introduces no behavioral
> changes by default). The first patch in the series renames some local
> variables whose name is made ambiguous by the second, main patch.

The idea is growing on me a bit. It doesn't give exactly v12 behavior,
but it does offer another lever that might tackle a lot of the
practical cases. If I were making the decision alone, I'd still choose
the escape hatch based on simplicity, but I'm fine with this approach
as well.

The patch itself looks reasonable to me. I don't see a lot of obvious
dangers, but perhaps someone would like to take a closer look at the
planner changes as you suggest.

Regards,
	Jeff Davis

Commits

  1. Add hash_mem_multiplier GUC.

  2. HashAgg: use better cardinality estimate for recursive spilling.

  3. Remove hashagg_avoid_disk_plan GUC.

  4. Doc fixup for hashagg_avoid_disk_plan GUC.

  5. Rework HashAgg GUCs.

  6. Disk-based Hash Aggregation.

  7. Implement partition-wise grouping/aggregation.

  8. Defer creation of partially-grouped relation until it's needed.