Postgres95 1.01 Distribution - Virgin SourcesPG95-1_01

1 files changed, 82 insertions, 0 deletions

diff --git a/src/backend/executor/hashjoin.h b/src/backend/executor/hashjoin.h
new file mode 100644
index 00000000000..e7ae086fe16
--- /dev/null
+++ b/src/backend/executor/hashjoin.h
@@ -0,0 +1,82 @@
+/*-------------------------------------------------------------------------
+ *
+ * hashjoin.h--
+ *    internal structures for hash table and buckets
+ *
+ *
+ * Copyright (c) 1994, Regents of the University of California
+ *
+ * $Id: hashjoin.h,v 1.1.1.1 1996/07/09 06:21:25 scrappy Exp $
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef	HASHJOIN_H
+#define HASHJOIN_H
+
+#include "access/htup.h"
+#include "storage/ipc.h"
+
+/* -----------------
+ *  have to use relative address as pointers in the hashtable
+ *  because the hashtable may reallocate in difference processes
+ * -----------------
+ */
+typedef int	RelativeAddr;
+
+/* ------------------
+ *  the relative addresses are always relative to the head of the
+ *  hashtable, the following macro converts them to absolute address.
+ * ------------------
+ */
+#define ABSADDR(X)	((X) < 0 ? 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    outerbatchNames; 	/* RelativeAddr* */
+    RelativeAddr    outerbatchPos;	/* RelativeAddr* */
+    RelativeAddr    innerbatchNames; 	/* 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;
+
+#define HASH_PERMISSION         0700
+
+#endif	/* HASHJOIN_H */