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/*-------------------------------------------------------------------------
*
* hashjoin.h
* internal structures for hash table and buckets
*
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: hashjoin.h,v 1.10 1999/05/09 00:53:18 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef HASHJOIN_H
#define HASHJOIN_H
#include <storage/ipc.h>
/* -----------------
* have to use relative address as pointers in the hashtable
* because the hashtable may reallocate in different processes
*
* XXX: this relative-address stuff is useless on all supported platforms
* and is a ever-dangerous source of bugs. Really ought to rip it out.
* -----------------
*/
typedef int RelativeAddr;
/* ------------------
* The relative addresses are always relative to the head of the
* hashtable, the following macros convert them to/from absolute address.
* NULL is represented as -1 (CAUTION: RELADDR() doesn't handle that!).
* CAUTION: ABSADDR evaluates its arg twice!!
* ------------------
*/
#define ABSADDR(X) ((X) < 0 ? (char*) NULL : (char*)hashtable + (X))
#define RELADDR(X) ((RelativeAddr)((char*)(X) - (char*)hashtable))
typedef char **charPP;
typedef int *intP;
/* ----------------------------------------------------------------
* hash-join hash table structures
* ----------------------------------------------------------------
*/
typedef struct HashTableData
{
int nbuckets;
int totalbuckets;
int bucketsize;
IpcMemoryId shmid;
RelativeAddr top; /* char* */
RelativeAddr bottom; /* char* */
RelativeAddr overflownext; /* char* */
RelativeAddr batch; /* char* */
RelativeAddr readbuf; /* char* */
int nbatch;
RelativeAddr outerbatchPos; /* RelativeAddr* */
RelativeAddr innerbatchPos; /* RelativeAddr* */
RelativeAddr innerbatchSizes; /* int* */
int curbatch;
int nprocess;
int pcount;
} HashTableData; /* real hash table follows here */
typedef HashTableData *HashJoinTable;
typedef struct OverflowTupleData
{
RelativeAddr tuple; /* HeapTuple */
RelativeAddr next; /* struct OverflowTupleData * */
} OverflowTupleData; /* real tuple follows here */
typedef OverflowTupleData *OverflowTuple;
typedef struct HashBucketData
{
RelativeAddr top; /* HeapTuple */
RelativeAddr bottom; /* HeapTuple */
RelativeAddr firstotuple; /* OverflowTuple */
RelativeAddr lastotuple; /* OverflowTuple */
} HashBucketData; /* real bucket follows here */
typedef HashBucketData *HashBucket;
#endif /* HASHJOIN_H */
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