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Parallel executor support.

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This code provides infrastructure for a parallel leader to start up
parallel workers to execute subtrees of the plan tree being executed
in the master.  User-supplied parameters from ParamListInfo are passed
down, but PARAM_EXEC parameters are not.  Various other constructs,
such as initplans, subplans, and CTEs, are also not currently shared.
Nevertheless, there's enough here to support a basic implementation of
parallel query, and we can lift some of the current restrictions as
needed.

Amit Kapila and Robert Haas
This commit is contained in:
Robert Haas
2015-09-28 21:55:57 -04:00
parent 0557dc276f
commit d1b7c1ffe7
17 changed files with 1007 additions and 2 deletions
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3
src/backend/executor/Makefile
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@@ -13,7 +13,8 @@ top_builddir = ../../..
include $(top_builddir)/src/Makefile.global
OBJS = execAmi.o execCurrent.o execGrouping.o execIndexing.o execJunk.o \
execMain.o execProcnode.o execQual.o execScan.o execTuples.o \
execMain.o execParallel.o execProcnode.o execQual.o \
execScan.o execTuples.o \
execUtils.o functions.o instrument.o nodeAppend.o nodeAgg.o \
nodeBitmapAnd.o nodeBitmapOr.o \
nodeBitmapHeapscan.o nodeBitmapIndexscan.o nodeCustom.o nodeHash.o \