Postgres95 1.01 Distribution - Virgin Sources

src/backend/utils/cache/rel.c

@@ -0,0 +1,77 @@
+/*-------------------------------------------------------------------------
+ *
+ * rel.c--
+ *    POSTGRES relation descriptor code.
+ *
+ * Copyright (c) 1994, Regents of the University of California
+ *
+ *
+ * IDENTIFICATION
+ *    $Header: /cvsroot/pgsql/src/backend/utils/cache/Attic/rel.c,v 1.1.1.1 1996/07/09 06:22:06 scrappy Exp $
+ *
+ *-------------------------------------------------------------------------
+ */
+/* #define RELREFDEBUG	1 */
+
+#include "postgres.h"
+#include "miscadmin.h"
+#include "access/istrat.h"
+#include "access/tupdesc.h"
+#include "utils/rel.h"
+#include "storage/fd.h"
+
+
+/* 
+ *	RelationIsValid is now a macro in rel.h -cim 4/27/91
+ *
+ *      Many of the RelationGet...() functions are now macros in rel.h
+ *		-mer 3/2/92
+ */
+
+/*
+ * RelationGetIndexStrategy --
+ *	Returns index strategy for a relation.
+ *
+ * Note:
+ *	Assumes relation descriptor is valid.
+ *	Assumes relation descriptor is for an index relation.
+ */
+IndexStrategy
+RelationGetIndexStrategy(Relation relation)
+{
+  return relation->rd_istrat;
+}
+
+/*
+ * RelationSetIndexSupport --
+ *	Sets index strategy and support info for a relation.
+ *
+ * Note:
+ *	Assumes relation descriptor is a valid pointer to sufficient space.
+ *	Assumes index strategy is valid.  Assumes support is valid if non-
+ *	NULL.
+ */
+/* ----------------
+ *	RelationSetIndexSupport
+ *
+ *	This routine saves two pointers -- one to the IndexStrategy, and
+ *	one to the RegProcs that support the indexed access method.  These
+ *	pointers are stored in the space following the attribute data in the
+ *	reldesc.
+ *
+ *   NEW:  the index strategy and support are now stored in real fields
+ *         at the end of the structure                    - jolly
+ * ----------------
+ */
+void
+RelationSetIndexSupport(Relation relation,
+			IndexStrategy strategy,
+			RegProcedure *support)
+{
+    Assert(PointerIsValid(relation));
+    Assert(IndexStrategyIsValid(strategy));
+    
+    relation->rd_istrat = strategy;
+    relation->rd_support = support;
+}
+