nodeHash.h

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/*-------------------------------------------------------------------------
 *
 * nodeHash.h
 *    prototypes for nodeHash.c
 *
 *
 * Portions Copyright (c) 1996-2025, 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 "access/parallel.h"
#include "nodes/execnodes.h"
 
struct SharedHashJoinBatch;
 
extern HashState *ExecInitHash(Hash *node, EState *estate, int eflags);
extern Node *MultiExecHash(HashState *node);
extern void ExecEndHash(HashState *node);
extern void ExecReScanHash(HashState *node);
 
extern HashJoinTable ExecHashTableCreate(HashState *state);
extern void ExecParallelHashTableAlloc(HashJoinTable hashtable,
                                       int batchno);
extern void ExecHashTableDestroy(HashJoinTable hashtable);
extern void ExecHashTableDetach(HashJoinTable hashtable);
extern void ExecHashTableDetachBatch(HashJoinTable hashtable);
extern void ExecParallelHashTableSetCurrentBatch(HashJoinTable hashtable,
                                                 int batchno);
 
extern void ExecHashTableInsert(HashJoinTable hashtable,
                                TupleTableSlot *slot,
                                uint32 hashvalue);
extern void ExecParallelHashTableInsert(HashJoinTable hashtable,
                                        TupleTableSlot *slot,
                                        uint32 hashvalue);
extern void ExecParallelHashTableInsertCurrentBatch(HashJoinTable hashtable,
                                                    TupleTableSlot *slot,
                                                    uint32 hashvalue);
extern void ExecHashGetBucketAndBatch(HashJoinTable hashtable,
                                      uint32 hashvalue,
                                      int *bucketno,
                                      int *batchno);
extern bool ExecScanHashBucket(HashJoinState *hjstate, ExprContext *econtext);
extern bool ExecParallelScanHashBucket(HashJoinState *hjstate, ExprContext *econtext);
extern void ExecPrepHashTableForUnmatched(HashJoinState *hjstate);
extern bool ExecParallelPrepHashTableForUnmatched(HashJoinState *hjstate);
extern bool ExecScanHashTableForUnmatched(HashJoinState *hjstate,
                                          ExprContext *econtext);
extern bool ExecParallelScanHashTableForUnmatched(HashJoinState *hjstate,
                                                  ExprContext *econtext);
extern void ExecHashTableReset(HashJoinTable hashtable);
extern void ExecHashTableResetMatchFlags(HashJoinTable hashtable);
extern void ExecChooseHashTableSize(double ntuples, int tupwidth, bool useskew,
                                    bool try_combined_hash_mem,
                                    int parallel_workers,
                                    size_t *space_allowed,
                                    int *numbuckets,
                                    int *numbatches,
                                    int *num_skew_mcvs);
extern int  ExecHashGetSkewBucket(HashJoinTable hashtable, uint32 hashvalue);
extern void ExecHashEstimate(HashState *node, ParallelContext *pcxt);
extern void ExecHashInitializeDSM(HashState *node, ParallelContext *pcxt);
extern void ExecHashInitializeWorker(HashState *node, ParallelWorkerContext *pwcxt);
extern void ExecHashRetrieveInstrumentation(HashState *node);
extern void ExecShutdownHash(HashState *node);
extern void ExecHashAccumInstrumentation(HashInstrumentation *instrument,
                                         HashJoinTable hashtable);
 
#endif                          /* NODEHASH_H */