Horton

Re: [HACKERS] WIP: [[Parallel] Shared] Hash

Michael Paquier <michael.paquier@gmail.com>

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From: Michael Paquier <michael.paquier@gmail.com>
To: Thomas Munro <thomas.munro@enterprisedb.com>
Cc: Oleg Golovanov <rentech@mail.ru>, Peter Geoghegan <pg@bowt.ie>, Rafia Sabih <rafia.sabih@enterprisedb.com>, Ashutosh Bapat <ashutosh.bapat@enterprisedb.com>, Haribabu Kommi <kommi.haribabu@gmail.com>, Pg Hackers <pgsql-hackers@postgresql.org>, Robert Haas <robertmhaas@gmail.com>, Andres Freund <andres@anarazel.de>
Date: 2017-11-30T01:20:03Z
Lists: pgsql-hackers 
On Wed, Jun 28, 2017 at 9:58 AM, Thomas Munro
<thomas.munro@enterprisedb.com> wrote:
> Rebased for the recent re-indent and shm_toc API change; no functional
> changes in this version.
>
> (I have a new patch set in the pipeline adding the skew optimisation
> and some other things, more on that soon.)

This patch does not apply. And the thread has stalled for three months
now but I cannot see a review for what has been submitted. I am moving
it to next CF with waiting on author. Please provide a rebased
version. If there are other threads on this topic, it would be nice to
link them to the existing CF entry
https://commitfest.postgresql.org/15/871/..
-- 
Michael

Commits

  1. Add shared tuplestores.

  2. Remove BufFile's isTemp flag.

  3. Provide DSM segment to ExecXXXInitializeWorker functions.

  4. Optimize joins when the inner relation can be proven unique.

  5. Fix failure to use clamp_row_est() for parallel joins.

  6. Document lack of validation when attaching foreign partitions.

  7. Fix inclusions of c.h from .h files.

  8. Fix inclusions of postgres_fe.h from .h files.

  9. Bring plpgsql into line with header inclusion policy.

  10. Document intentional violations of header inclusion policy.

  11. Shut down Gather's children before shutting down Gather itself.

  12. btree: Support parallel index scans.

  13. Add explicit ORDER BY to a few tests that exercise hash-join code.

  14. Revise hash join code so that we can increase the number of batches

  15. Rewrite hash join to use simple linked lists instead of a