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/*-------------------------------------------------------------------------
*
* nodeHash.h
* prototypes for nodeHash.c
*
*
* Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/executor/nodeHash.h,v 1.46 2009/01/01 17:23:59 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef NODEHASH_H
#define NODEHASH_H
#include "nodes/execnodes.h"
extern int ExecCountSlotsHash(Hash *node);
extern HashState *ExecInitHash(Hash *node, EState *estate, int eflags);
extern TupleTableSlot *ExecHash(HashState *node);
extern Node *MultiExecHash(HashState *node);
extern void ExecEndHash(HashState *node);
extern void ExecReScanHash(HashState *node, ExprContext *exprCtxt);
extern HashJoinTable ExecHashTableCreate(Hash *node, List *hashOperators);
extern void ExecHashTableDestroy(HashJoinTable hashtable);
extern void ExecHashTableInsert(HashJoinTable hashtable,
TupleTableSlot *slot,
uint32 hashvalue);
extern bool ExecHashGetHashValue(HashJoinTable hashtable,
ExprContext *econtext,
List *hashkeys,
bool outer_tuple,
bool keep_nulls,
uint32 *hashvalue);
extern void ExecHashGetBucketAndBatch(HashJoinTable hashtable,
uint32 hashvalue,
int *bucketno,
int *batchno);
extern HashJoinTuple ExecScanHashBucket(HashJoinState *hjstate,
ExprContext *econtext);
extern void ExecHashTableReset(HashJoinTable hashtable);
extern void ExecChooseHashTableSize(double ntuples, int tupwidth,
int *numbuckets,
int *numbatches);
#endif /* NODEHASH_H */
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