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b39e91501c
match because they contain a null join key (and the join operator is known strict). Improves performance significantly when the inner relation contains a lot of nulls, as per bug #2930.
48 lines
1.6 KiB
C
48 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) 1996-2007, 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 1.43 2007/01/28 23:21:26 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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TupleTableSlot *slot,
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uint32 hashvalue);
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extern bool ExecHashGetHashValue(HashJoinTable hashtable,
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ExprContext *econtext,
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List *hashkeys,
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bool keep_nulls,
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uint32 *hashvalue);
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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 HashJoinTuple 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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