1 files changed, 44 insertions, 0 deletions
diff --git a/contrib/bloom/blcost.c b/contrib/bloom/blcost.c
new file mode 100644
index 0000000..54f954d
--- /dev/null
+++ b/contrib/bloom/blcost.c
@@ -0,0 +1,44 @@
+/*-------------------------------------------------------------------------
+ *
+ * blcost.c
+ *		Cost estimate function for bloom indexes.
+ *
+ * Copyright (c) 2016-2020, PostgreSQL Global Development Group
+ *
+ * IDENTIFICATION
+ *	  contrib/bloom/blcost.c
+ *
+ *-------------------------------------------------------------------------
+ */
+#include "postgres.h"
+
+#include "bloom.h"
+#include "fmgr.h"
+#include "utils/selfuncs.h"
+
+/*
+ * Estimate cost of bloom index scan.
+ */
+void
+blcostestimate(PlannerInfo *root, IndexPath *path, double loop_count,
+			   Cost *indexStartupCost, Cost *indexTotalCost,
+			   Selectivity *indexSelectivity, double *indexCorrelation,
+			   double *indexPages)
+{
+	IndexOptInfo *index = path->indexinfo;
+	GenericCosts costs;
+
+	MemSet(&costs, 0, sizeof(costs));
+
+	/* We have to visit all index tuples anyway */
+	costs.numIndexTuples = index->tuples;
+
+	/* Use generic estimate */
+	genericcostestimate(root, path, loop_count, &costs);
+
+	*indexStartupCost = costs.indexStartupCost;
+	*indexTotalCost = costs.indexTotalCost;
+	*indexSelectivity = costs.indexSelectivity;
+	*indexCorrelation = costs.indexCorrelation;
+	*indexPages = costs.numIndexPages;
+}