address comment

executor/aggregate_test.go

@@ -312,8 +312,10 @@ func (s *testSuite) TestAggregation(c *C) {
 
 	// test agg bit col
 	tk.MustExec("drop table t")
-	tk.MustExec("create table t(a bit(1))")
+	tk.MustExec("CREATE TABLE `t` (`a` bit(1) NOT NULL, PRIMARY KEY (`a`))")
 	tk.MustExec("insert into t value(1), (0)")
+	tk.MustQuery("select a from t group by 1")
+	tk.MustQuery("select max(a) from t group by a")
 	result = tk.MustQuery("select cast(a as signed) as idx, cast(max(a) as signed),  cast(min(a) as signed) from t group by 1 order by idx")
 	result.Check(testkit.Rows("0 0 0", "1 1 1"))
 }