remove unrealted test

executor/tiflash_test.go

@@ -520,28 +520,6 @@ func (s *tiflashTestSuite) TestMppUnionAll(c *C) {
 
 }
 
-func (s *tiflashTestSuite) TestUnionWithEmptyDualTable(c *C) {
-	tk := testkit.NewTestKit(c, s.store)
-	tk.MustExec("use test")
-	tk.MustExec("drop table if exists t")
-	tk.MustExec("drop table if exists t1")
-	tk.MustExec("create table t (a int not null, b int, c varchar(20))")
-	tk.MustExec("create table t1 (a int, b int not null, c double)")
-	tk.MustExec("alter table t set tiflash replica 1")
-	tk.MustExec("alter table t1 set tiflash replica 1")
-	tb := testGetTableByName(c, tk.Se, "test", "t")
-	err := domain.GetDomain(tk.Se).DDL().UpdateTableReplicaInfo(tk.Se, tb.Meta().ID, true)
-	c.Assert(err, IsNil)
-	tb = testGetTableByName(c, tk.Se, "test", "t1")
-	err = domain.GetDomain(tk.Se).DDL().UpdateTableReplicaInfo(tk.Se, tb.Meta().ID, true)
-	c.Assert(err, IsNil)
-	tk.MustExec("insert into t values(1,2,3)")
-	tk.MustExec("insert into t1 values(1,2,3)")
-	tk.MustExec("set @@session.tidb_isolation_read_engines=\"tiflash\"")
-	tk.MustExec("set @@session.tidb_enforce_mpp=ON")
-	tk.MustQuery("select count(*) from (select a , b from t union all select a , c from t1 where false) tt").Check(testkit.Rows("1"))
-}
-
 func (s *tiflashTestSuite) TestAvgOverflow(c *C) {
 	tk := testkit.NewTestKit(c, s.store)
 	tk.MustExec("use test")