Horton

Re: POC: GROUP BY optimization

Alexander Korotkov <aekorotkov@gmail.com>

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From: Alexander Korotkov <aekorotkov@gmail.com>
To: Nathan Bossart <nathandbossart@gmail.com>
Cc: Andrei Lepikhov <a.lepikhov@postgrespro.ru>, Richard Guo <guofenglinux@gmail.com>, Pavel Borisov <pashkin.elfe@gmail.com>, vignesh C <vignesh21@gmail.com>, PostgreSQL Developers <pgsql-hackers@lists.postgresql.org>, Tomas Vondra <tomas.vondra@enterprisedb.com>, Teodor Sigaev <teodor@sigaev.ru>, David Rowley <dgrowleyml@gmail.com>, "a.rybakina" <a.rybakina@postgrespro.ru>, Tom Lane <tgl@sss.pgh.pa.us>
Date: 2024-01-24T19:44:56Z
Lists: pgsql-hackers

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

  1. Restore preprocess_groupclause()

  2. Rename PathKeyInfo to GroupByOrdering

  3. Add invariants check to get_useful_group_keys_orderings()

  4. Fix asymmetry in setting EquivalenceClass.ec_sortref

  5. Multiple revisions to the GROUP BY reordering tests

  6. Get rid of pg_class usage in SJE regression tests

  7. Rename index "abc" in aggregates.sql

  8. Explore alternative orderings of group-by pathkeys during optimization.

  9. Generalize the common code of adding sort before processing of grouping

  10. Fix out-dated comment in preprocess_groupclause()

  11. Force parallelism in partition_aggregate

  12. Optimize order of GROUP BY keys

On Wed, Jan 24, 2024 at 7:38 PM Nathan Bossart <nathandbossart@gmail.com> wrote:
> A recent buildfarm failure [0] seems to indicate a name collision with the
> "abc" index in the aggregates.sql test and the "abc" table in
> namespace.sql.
>
> [0] https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=piculet&dt=2024-01-24%2014%3A05%3A14

Thank you for catching this.  Fixed.

------
Regards,
Alexander Korotkov