Use ONLY keywords on PG11 deparser

src/backend/distributed/deparser/ruleutils_11.c

@@ -7055,7 +7055,8 @@ get_from_clause_item(Node *jtnode, Query *query, deparse_context *context)
 					ExtractRangeTblExtraData(rte, NULL, &fragmentSchemaName, &fragmentTableName, NULL);
 
 					/* use schema and table name from the remote alias */
-					appendStringInfoString(buf,
+					appendStringInfo(buf, "%s%s",
+									 only_marker(rte),
 									 generate_fragment_name(fragmentSchemaName,
 															fragmentTableName));
 					break;