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bfc78d7196
In the previous coding, before returning from ExecutorRun, we'd shut
down all parallel workers. This was dead wrong if ExecutorRun was
called with a non-zero tuple count; it had the effect of truncating
the query output. To fix, give ExecutePlan control over whether to
enter parallel mode, and have it refuse to do so if the tuple count
is non-zero. Rewrite the Gather logic so that it can cope with being
called outside parallel mode.
Commit 7aea8e4f2d is largely to blame
for this problem, though this patch modifies some subsequently-committed
code which relied on the guarantees it purported to make.
38 lines
1.1 KiB
C
38 lines
1.1 KiB
C
/*--------------------------------------------------------------------
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* execParallel.h
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* POSTGRES parallel execution interface
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*
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* Portions Copyright (c) 1996-2015, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* IDENTIFICATION
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* src/include/executor/execParallel.h
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*--------------------------------------------------------------------
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*/
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#ifndef EXECPARALLEL_H
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#define EXECPARALLEL_H
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#include "access/parallel.h"
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#include "nodes/execnodes.h"
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#include "nodes/parsenodes.h"
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#include "nodes/plannodes.h"
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typedef struct SharedExecutorInstrumentation SharedExecutorInstrumentation;
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typedef struct ParallelExecutorInfo
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{
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PlanState *planstate;
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ParallelContext *pcxt;
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BufferUsage *buffer_usage;
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SharedExecutorInstrumentation *instrumentation;
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shm_mq_handle **tqueue;
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} ParallelExecutorInfo;
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extern ParallelExecutorInfo *ExecInitParallelPlan(PlanState *planstate,
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EState *estate, int nworkers);
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extern void ExecParallelFinish(ParallelExecutorInfo *pei);
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extern void ExecParallelCleanup(ParallelExecutorInfo *pei);
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#endif /* EXECPARALLEL_H */
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