func TestIssue40135Ver2(t *testing.T) {
	store, dom := testkit.CreateMockStoreAndDomain(t)
	tk := testkit.NewTestKit(t, store)
	tk.MustExec("use test")

	tk1 := testkit.NewTestKit(t, store)
	tk1.MustExec("use test")

	tk3 := testkit.NewTestKit(t, store)
	tk3.MustExec("use test")

	tk.MustExec("CREATE TABLE t40135 ( a int DEFAULT NULL, b varchar(32) DEFAULT 'md', index(a)) PARTITION BY HASH (a) PARTITIONS 6")
	tk.MustExec("insert into t40135 values (1, 'md'), (2, 'ma'), (3, 'md'), (4, 'ma'), (5, 'md'), (6, 'ma')")
	one := true
	hook := &ddl.TestDDLCallback{Do: dom}
	var checkErr error
	var wg sync.WaitGroup
	wg.Add(1)
	hook.OnJobRunBeforeExported = func(job *model.Job) {
		if job.SchemaState == model.StateDeleteOnly {
			tk3.MustExec("delete from t40135 where a = 1")
		}
		if one {
			one = false
			go func() {
				_, checkErr = tk1.Exec("alter table t40135 modify column a int NULL")
				wg.Done()
			}()
		}
	}
	dom.DDL().SetHook(hook)
	tk.MustExec("alter table t40135 modify column a bigint NULL DEFAULT '6243108' FIRST")
	wg.Wait()
	require.NoError(t, checkErr)
	tk.MustExec("admin check table t40135")
}