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Allow parallel custom and foreign scans.

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This patch doesn't put the new infrastructure to use anywhere, and
indeed it's not clear how it could ever be used for something like
postgres_fdw which has to send an SQL query and wait for a reply,
but there might be FDWs or custom scan providers that are CPU-bound,
so let's give them a way to join club parallel.

KaiGai Kohei, reviewed by me.
This commit is contained in:
Robert Haas
2016-02-03 12:46:18 -05:00
parent 25e44518c1
commit 69d34408e5
9 changed files with 263 additions and 1 deletions
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11
src/include/executor/nodeCustom.h
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@ -12,6 +12,7 @@
#ifndef NODECUSTOM_H
#define NODECUSTOM_H
#include "access/parallel.h"
#include "nodes/execnodes.h"
/*
@ -26,4 +27,14 @@ extern void ExecReScanCustomScan(CustomScanState *node);
extern void ExecCustomMarkPos(CustomScanState *node);
extern void ExecCustomRestrPos(CustomScanState *node);
/*
* Parallel execution support
*/
extern void ExecCustomScanEstimate(CustomScanState *node,
ParallelContext *pcxt);
extern void ExecCustomScanInitializeDSM(CustomScanState *node,
ParallelContext *pcxt);
extern void ExecCustomScanInitializeWorker(CustomScanState *node,
shm_toc *toc);
#endif /* NODECUSTOM_H */