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This is expected to be useful mostly when performing such scans in parallel, because in that case it allows (in combination with commit acf555bc53acb589b5a2827e65d655fa8c9adee0) nodes below a Gather to get control just before the DSM segment goes away. KaiGai Kohei, except that I rewrote the documentation. Reviewed by Claudio Freire. Discussion: http://postgr.es/m/CADyhKSXJK0jUJ8rWv4AmKDhsUh124_rEn39eqgfC5D8fu6xVuw@mail.gmail.com
34 lines
1.1 KiB
C
34 lines
1.1 KiB
C
/*-------------------------------------------------------------------------
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*
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* nodeForeignscan.h
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*
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*
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*
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* Portions Copyright (c) 1996-2017, 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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* src/include/executor/nodeForeignscan.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef NODEFOREIGNSCAN_H
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#define NODEFOREIGNSCAN_H
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#include "access/parallel.h"
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#include "nodes/execnodes.h"
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extern ForeignScanState *ExecInitForeignScan(ForeignScan *node, EState *estate, int eflags);
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extern TupleTableSlot *ExecForeignScan(ForeignScanState *node);
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extern void ExecEndForeignScan(ForeignScanState *node);
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extern void ExecReScanForeignScan(ForeignScanState *node);
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extern void ExecForeignScanEstimate(ForeignScanState *node,
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ParallelContext *pcxt);
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extern void ExecForeignScanInitializeDSM(ForeignScanState *node,
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ParallelContext *pcxt);
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extern void ExecForeignScanInitializeWorker(ForeignScanState *node,
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shm_toc *toc);
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extern void ExecShutdownForeignScan(ForeignScanState *node);
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#endif /* NODEFOREIGNSCAN_H */
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