1 files changed, 40 insertions, 0 deletions
diff --git a/src/backend/optimizer/geqo/geqo_random.c b/src/backend/optimizer/geqo/geqo_random.c
new file mode 100644
index 0000000..f21bc04
--- /dev/null
+++ b/src/backend/optimizer/geqo/geqo_random.c
@@ -0,0 +1,40 @@
+/*------------------------------------------------------------------------
+ *
+ * geqo_random.c
+ *	   random number generator
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/backend/optimizer/geqo/geqo_random.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include "optimizer/geqo_random.h"
+
+
+void
+geqo_set_seed(PlannerInfo *root, double seed)
+{
+	GeqoPrivateData *private = (GeqoPrivateData *) root->join_search_private;
+
+	/*
+	 * XXX. This seeding algorithm could certainly be improved - but it is not
+	 * critical to do so.
+	 */
+	memset(private->random_state, 0, sizeof(private->random_state));
+	memcpy(private->random_state,
+		   &seed,
+		   Min(sizeof(private->random_state), sizeof(seed)));
+}
+
+double
+geqo_rand(PlannerInfo *root)
+{
+	GeqoPrivateData *private = (GeqoPrivateData *) root->join_search_private;
+
+	return pg_erand48(private->random_state);
+}