[CF 5711] v5 - temporary file usage report with extended protocol and unnamed portals

This branch was automatically generated by a robot using patches from an
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https://commitfest.postgresql.org/patch/5711

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Patch(es): https://www.postgresql.org/message-id/CAA5RZ0vGPa=UjiNiS0gK1zHVhysSBPMSaGU5Qc=1PrVKJ6ODCw@mail.gmail.com
Author(s): Frédéric Yhuel

Author: Commitfest Bot

src/backend/tcop/postgres.c

@@ -2321,6 +2321,10 @@ exec_execute_message(const char *portal_name, long max_rows)
 			 * message.  The next protocol message will start a fresh timeout.
 			 */
 			disable_statement_timeout();
+
+			/* unnamed portal executed to completion, so close it */
+			if (portal_name[0] == '\0')
+				PortalDrop(portal, false);
 		}
 
 		/* Send appropriate CommandComplete to client */