Postgres95 1.01 Distribution - Virgin Sources

src/backend/utils/adt/geo-selfuncs.c

@@ -0,0 +1,124 @@
+/*-------------------------------------------------------------------------
+ *
+ * geo-selfuncs.c--
+ *    Selectivity routines registered in the operator catalog in the
+ *    "oprrest" and "oprjoin" attributes.
+ *
+ * Copyright (c) 1994, Regents of the University of California
+ *
+ *
+ * IDENTIFICATION
+ *    $Header: /cvsroot/pgsql/src/backend/utils/adt/Attic/geo-selfuncs.c,v 1.1.1.1 1996/07/09 06:22:04 scrappy Exp $
+ *
+ *	XXX These are totally bogus.
+ *
+ *-------------------------------------------------------------------------
+ */
+#include "postgres.h"
+
+#include "access/attnum.h"
+#include "utils/geo-decls.h"	/* where function declarations go */
+#include "utils/palloc.h"
+
+float64
+areasel(Oid opid, 
+	Oid relid, 
+	AttrNumber attno, 
+	char *value,
+	int32 flag)
+{
+    float64	result;
+    
+    result = (float64) palloc(sizeof(float64data));
+    *result = 1.0 / 4.0;
+    return(result);
+}
+
+float64
+areajoinsel(Oid opid,
+	    Oid relid,
+	    AttrNumber attno,
+	    char *value,
+	    int32 flag)
+{
+    float64	result;
+    
+    result = (float64) palloc(sizeof(float64data));
+    *result = 1.0 / 4.0;
+    return(result);
+}
+
+/*
+ *  Selectivity functions for rtrees.  These are bogus -- unless we know
+ *  the actual key distribution in the index, we can't make a good prediction
+ *  of the selectivity of these operators.
+ *
+ *  In general, rtrees need to search multiple subtrees in order to guarantee
+ *  that all occurrences of the same key have been found.  Because of this,
+ *  the heuristic selectivity functions we return are higher than they would
+ *  otherwise be.
+ */
+
+/*
+ *  left_sel -- How likely is a box to be strictly left of (right of, above,
+ *		below) a given box?
+ */
+
+float64
+leftsel(Oid opid,
+	Oid relid,
+	AttrNumber attno,
+	char *value,
+	int32 flag)
+{
+    float64	result;
+    
+    result = (float64) palloc(sizeof(float64data));
+    *result = 1.0 / 6.0;
+    return(result);
+}
+
+float64
+leftjoinsel(Oid opid,
+	    Oid relid,
+	    AttrNumber attno,
+	    char *value,
+	    int32 flag)
+{
+    float64	result;
+    
+    result = (float64) palloc(sizeof(float64data));
+    *result = 1.0 / 6.0;
+    return(result);
+}
+
+/*
+ *  contsel -- How likely is a box to contain (be contained by) a given box?
+ */
+float64
+contsel(Oid opid,
+	Oid relid,
+	AttrNumber attno,
+	char *value,
+	int32 flag)
+{
+    float64	result;
+    
+    result = (float64) palloc(sizeof(float64data));
+    *result = 1.0 / 10.0;
+    return(result);
+}
+
+float64
+contjoinsel(Oid opid,
+	    Oid relid,
+	    AttrNumber attno,
+	    char *value,
+	    int32 flag)
+{
+    float64	result;
+    
+    result = (float64) palloc(sizeof(float64data));
+    *result = 1.0 / 10.0;
+    return(result);
+}