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//usr/include/pgsql/server/executor/nodeHash.h

/*-------------------------------------------------------------------------
 *
 * nodeHash.h
 *	  prototypes for nodeHash.c
 *
 *
 * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/executor/nodeHash.h
 *
 *-------------------------------------------------------------------------
 */
#ifndef NODEHASH_H
#define NODEHASH_H

#include "nodes/execnodes.h"

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);

extern HashJoinTable ExecHashTableCreate(Hash *node, List *hashOperators,
					bool keepNulls);
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 bool ExecScanHashBucket(HashJoinState *hjstate, ExprContext *econtext);
extern void ExecPrepHashTableForUnmatched(HashJoinState *hjstate);
extern bool ExecScanHashTableForUnmatched(HashJoinState *hjstate,
							  ExprContext *econtext);
extern void ExecHashTableReset(HashJoinTable hashtable);
extern void ExecHashTableResetMatchFlags(HashJoinTable hashtable);
extern void ExecChooseHashTableSize(double ntuples, int tupwidth, bool useskew,
						int *numbuckets,
						int *numbatches,
						int *num_skew_mcvs);
extern int	ExecHashGetSkewBucket(HashJoinTable hashtable, uint32 hashvalue);

#endif   /* NODEHASH_H */