Silence WARNINGs about missing out function with DEBUG5

If log_min_messages = 'debug5', we call the text output function for
everything that's serialized to be sent from QD to QEs. I added a new
node type, QueryDispatchDesc, in commit 41478b89, but I only gave it
the "fast" output function, not the text version. That produced a
warning about missing output function, with log_min_messages='debug5'.

This fixes the failure of qp_executor test, reported by Omar Arap.

src/backend/nodes/outfast.c

@@ -355,17 +355,6 @@ _outPlannedStmt(StringInfo str, PlannedStmt *node)
 	WRITE_UINT64_FIELD(query_mem);
 }
 
-static void
-_outQueryDispatchDesc(StringInfo str, QueryDispatchDesc *node)
-{
-	WRITE_NODE_TYPE("QUERYDISPATCHDESC");
-
-	WRITE_NODE_FIELD(transientTypeRecords);
-	WRITE_NODE_FIELD(intoOidInfo);
-	WRITE_STRING_FIELD(intoTableSpaceName);
-	WRITE_NODE_FIELD(sliceTable);
-}
-
 static void
 outLogicalIndexInfo(StringInfo str, LogicalIndexInfo *node)
 {

src/backend/nodes/outfuncs.c

@@ -321,6 +321,17 @@ _outPlannedStmt(StringInfo str, PlannedStmt *node)
 }
 #endif /* COMPILING_BINARY_FUNCS */
 
+static void
+_outQueryDispatchDesc(StringInfo str, QueryDispatchDesc *node)
+{
+	WRITE_NODE_TYPE("QUERYDISPATCHDESC");
+
+	WRITE_NODE_FIELD(transientTypeRecords);
+	WRITE_NODE_FIELD(intoOidInfo);
+	WRITE_STRING_FIELD(intoTableSpaceName);
+	WRITE_NODE_FIELD(sliceTable);
+}
+
 #ifndef COMPILING_BINARY_FUNCS
 /*
  * print the basic stuff of all nodes that inherit from Plan
@@ -4241,6 +4252,9 @@ _outNode(StringInfo str, void *obj)
 			case T_PlannedStmt:
 				_outPlannedStmt(str, obj);
 				break;
+			case T_QueryDispatchDesc:
+				_outQueryDispatchDesc(str, obj);
+				break;
 			case T_Plan:
 				_outPlan(str, obj);
 				break;