fix case

tests/system-test/2-query/union.py

@@ -140,7 +140,6 @@ class TDTestCase:
                     having_claus = self.__group_condition( col=select_claus, having=f"{select_claus} is not null")
                     sqls.extend(
                         (
-                            self.__single_sql(select_claus, self.__join_condition(join_tblist), where_claus, having_claus),
                             self.__single_sql(select_claus, self.__join_condition(join_tblist, INNER=True), where_claus, having_claus),
                         )
                     )
@@ -154,7 +153,6 @@ class TDTestCase:
                     sqls.extend(
                         (
                             self.__single_sql(select_claus, join_tb, where_claus, having_claus),
-                            self.__single_sql(select_claus, join_tb),
                         )
                     )