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diff --git a/src/include/storage/backendid.h b/src/include/storage/backendid.h
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+/*-------------------------------------------------------------------------
+ *
+ * backendid.h
+ *	  POSTGRES backend id communication definitions
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/storage/backendid.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef BACKENDID_H
+#define BACKENDID_H
+
+/* ----------------
+ *		-cim 8/17/90
+ * ----------------
+ */
+typedef int BackendId;			/* unique currently active backend identifier */
+
+#define InvalidBackendId		(-1)
+
+extern PGDLLIMPORT BackendId MyBackendId;	/* backend id of this backend */
+
+/* backend id of our parallel session leader, or InvalidBackendId if none */
+extern PGDLLIMPORT BackendId ParallelMasterBackendId;
+
+/*
+ * The BackendId to use for our session's temp relations is normally our own,
+ * but parallel workers should use their leader's ID.
+ */
+#define BackendIdForTempRelations() \
+	(ParallelMasterBackendId == InvalidBackendId ? MyBackendId : ParallelMasterBackendId)
+
+#endif							/* BACKENDID_H */