This is temporal place holder for Relation File Node till

reloid.version/unique_id file naming is not implemented

src/include/storage/relfilenode.h

+#ifndef RELFILENODE_H
+#define RELFILENODE_H
+
+/*
+ * This is temporal place holder for Relation File Node till
+ * reloid.version/unique_id file naming is not implemented
+ */
+typedef struct RelFileNode
+{
+	Oid					dbId;		/* database */
+	Oid					relId;		/* relation */
+} RelFileNode;
+
+#endif	/* RELFILENODE_H */