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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
31 lines
1.1 KiB
C
31 lines
1.1 KiB
C
/*-------------------------------------------------------------------------
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*
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* nodeBitmapHeapscan.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/nodeBitmapHeapscan.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef NODEBITMAPHEAPSCAN_H
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#define NODEBITMAPHEAPSCAN_H
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#include "nodes/execnodes.h"
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#include "access/parallel.h"
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extern BitmapHeapScanState *ExecInitBitmapHeapScan(BitmapHeapScan *node, EState *estate, int eflags);
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extern TupleTableSlot *ExecBitmapHeapScan(BitmapHeapScanState *node);
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extern void ExecEndBitmapHeapScan(BitmapHeapScanState *node);
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extern void ExecReScanBitmapHeapScan(BitmapHeapScanState *node);
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extern void ExecBitmapHeapEstimate(BitmapHeapScanState *node,
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ParallelContext *pcxt);
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extern void ExecBitmapHeapInitializeDSM(BitmapHeapScanState *node,
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ParallelContext *pcxt);
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extern void ExecBitmapHeapInitializeWorker(BitmapHeapScanState *node,
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shm_toc *toc);
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#endif /* NODEBITMAPHEAPSCAN_H */
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