Horton

Re: [PATCH] Incremental sort (was: PoC: Partial sort)

Dmitry Dolgov <9erthalion6@gmail.com>

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From: Dmitry Dolgov <9erthalion6@gmail.com>
To: Alexander Korotkov <a.korotkov@postgrespro.ru>
Cc: Tomas Vondra <tomas.vondra@2ndquadrant.com>, James Coleman <jtc331@gmail.com>, Tom Lane <tgl@sss.pgh.pa.us>, PostgreSQL Developers <pgsql-hackers@lists.postgresql.org>
Date: 2018-11-30T12:38:46Z
Lists: pgsql-hackers 
> On Mon, Mar 20, 2017 at 10:34 AM Alexander Korotkov <a.korotkov@postgrespro.ru> wrote:
>
> Please, find rebased patch in the attachment.

It's been a while since this patch was posted. There is already some amount of
feedback in this thread, and the patch itself unfortunately has some conflicts
with the current master. Alexander, do you have any plans about this feature?
For now probably I'll mark it as "Returned with feedback".

Commits

  1. Further adjustments to Hashagg EXPLAIN ANALYZE output

  2. Rework EXPLAIN format for incremental sort

  3. Fix typos and improve incremental sort comments

  4. Stabilize incremental_sort tests

  5. Minor improvements in Incremental Sort explain

  6. Consider Incremental Sort paths at additional places

  7. Fix representation of SORT_TYPE_STILL_IN_PROGRESS.

  8. Fix failures in incremental_sort due to number of workers

  9. Fix show_incremental_sort_info with force_parallel_mode

  10. Implement Incremental Sort

  11. Fix handling of "Subplans Removed" field in EXPLAIN output.

  12. Fix EXPLAIN (SETTINGS) to follow policy about when to print empty fields.

  13. Ensure plpgsql result tuples have the right composite type marking.

  14. Propagate sort instrumentation from workers back to leader.

  15. Make new regression test case parallel-safe, and improve its output.

  16. Push limit through subqueries to underlying sort, where possible.

  17. Fix inappropriate printing of never-measured times in EXPLAIN.

  18. Fix some infelicities in EXPLAIN output for parallel query plans.