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2c0ef9777c
bits indicating which optional capabilities can actually be exercised at runtime. This will allow Sort and Material nodes, and perhaps later other nodes, to avoid unnecessary overhead in common cases. This commit just adds the infrastructure and arranges to pass the correct flag values down to plan nodes; none of the actual optimizations are here yet. I'm committing this separately in case anyone wants to measure the added overhead. (It should be negligible.) Simon Riggs and Tom Lane
46 lines
1.6 KiB
C
46 lines
1.6 KiB
C
/*-------------------------------------------------------------------------
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*
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* nodeHash.h
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* prototypes for nodeHash.c
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*
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*
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* Portions Copyright (c) 1996-2005, 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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* $PostgreSQL: pgsql/src/include/executor/nodeHash.h,v 1.39 2006/02/28 04:10:28 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef NODEHASH_H
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#define NODEHASH_H
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#include "nodes/execnodes.h"
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extern int ExecCountSlotsHash(Hash *node);
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extern HashState *ExecInitHash(Hash *node, EState *estate, int eflags);
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extern TupleTableSlot *ExecHash(HashState *node);
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extern Node *MultiExecHash(HashState *node);
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extern void ExecEndHash(HashState *node);
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extern void ExecReScanHash(HashState *node, ExprContext *exprCtxt);
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extern HashJoinTable ExecHashTableCreate(Hash *node, List *hashOperators);
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extern void ExecHashTableDestroy(HashJoinTable hashtable);
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extern void ExecHashTableInsert(HashJoinTable hashtable,
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HeapTuple tuple,
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uint32 hashvalue);
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extern uint32 ExecHashGetHashValue(HashJoinTable hashtable,
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ExprContext *econtext,
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List *hashkeys);
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extern void ExecHashGetBucketAndBatch(HashJoinTable hashtable,
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uint32 hashvalue,
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int *bucketno,
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int *batchno);
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extern HeapTuple ExecScanHashBucket(HashJoinState *hjstate,
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ExprContext *econtext);
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extern void ExecHashTableReset(HashJoinTable hashtable);
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extern void ExecChooseHashTableSize(double ntuples, int tupwidth,
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int *numbuckets,
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int *numbatches);
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#endif /* NODEHASH_H */
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