Horton

Support parallel bitmap heap scans.

Robert Haas <rhaas@postgresql.org>

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Commit: f35742ccb7aa53ee3ed8416bbb378b0c3eeb6bb9
Author: Robert Haas <rhaas@postgresql.org>
Date: 2017-03-08T17:05:43Z
Releases: 10.0 
Support parallel bitmap heap scans.

The index is scanned by a single process, but then all cooperating
processes can iterate jointly over the resulting set of heap blocks.
In the future, we might also want to support using a parallel bitmap
index scan to set up for a parallel bitmap heap scan, but that's a
job for another day.

Dilip Kumar, with some corrections and cosmetic changes by me.  The
larger patch set of which this is a part has been reviewed and tested
by (at least) Andres Freund, Amit Khandekar, Tushar Ahuja, Rafia
Sabih, Haribabu Kommi, Thomas Munro, and me.

Discussion: http://postgr.es/m/CAFiTN-uc4=0WxRGfCzs-xfkMYcSEWUC-Fon6thkJGjkh9i=13A@mail.gmail.com

Files

PathChange+/−
doc/src/sgml/monitoring.sgml modified +5 −1
src/backend/access/heap/heapam.c modified +16 −0
src/backend/executor/execParallel.c modified +14 −0
src/backend/executor/nodeBitmapHeapscan.c modified +378 −44
src/backend/executor/nodeBitmapIndexscan.c modified +3 −1
src/backend/executor/nodeBitmapOr.c modified +3 −1
src/backend/nodes/copyfuncs.c modified +2 −0
src/backend/nodes/outfuncs.c modified +2 −0
src/backend/nodes/readfuncs.c modified +2 −0
src/backend/optimizer/path/allpaths.c modified +24 −0
src/backend/optimizer/path/costsize.c modified +15 −1
src/backend/optimizer/path/indxpath.c modified +17 −2
src/backend/optimizer/plan/createplan.c modified +22 −0
src/backend/optimizer/util/pathnode.c modified +5 −4
src/backend/postmaster/pgstat.c modified +3 −0
src/include/access/heapam.h modified +1 −0
src/include/executor/nodeBitmapHeapscan.h modified +7 −0
src/include/nodes/execnodes.h modified +57 −0
src/include/nodes/plannodes.h modified +2 −0
src/include/optimizer/pathnode.h modified +2 −1
src/include/optimizer/paths.h modified +2 −0
src/include/pgstat.h modified +1 −0
src/test/regress/expected/select_parallel.out modified +19 −0
src/test/regress/sql/select_parallel.sql modified +10 −0

Documentation touched

Discussion