Index column offset out of bound

[wjhuang2016]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

	store, dom := testkit.CreateMockStoreAndDomainWithSchemaLease(t, dbTestLease)

	tk := testkit.NewTestKit(t, store)
	tk2 := testkit.NewTestKit(t, store)
	tk.MustExec("use test")
	tk2.MustExec("use test")
	tk.MustExec("CREATE TABLE t (  `b7b8a741-2759-4111-a78c-66f85cad4b59` bigint(20) DEFAULT '-5604021856061349662',   `5183ba5d-7305-4e49-8859-9b0e3ca99393` float DEFAULT '1.5656552',  UNIQUE KEY `b668df57-0687-4b20-a829-790ebd5cc2bf` (`b7b8a741-2759-4111-a78c-66f85cad4b59`),  KEY `5d3a3c82-ede6-4583-8f83-28f3a8cb8777` (`b7b8a741-2759-4111-a78c-66f85cad4b59`),  KEY `23501b4f-3274-4d3f-8305-f355d4949ae6` (`b7b8a741-2759-4111-a78c-66f85cad4b59`),  KEY `4ad74ca0-1470-44e7-94bd-772dcad6fa5f` (`b7b8a741-2759-4111-a78c-66f85cad4b59`))")

	hook := &ddl.TestDDLCallback{Do: dom}
	var checkErr1, checkErr2 error
	hook.OnJobRunBeforeExported = func(job *model.Job) {
		if job.SchemaState != model.StateWriteOnly {
			return
		}
		_, checkErr1 = tk2.Exec("insert ignore into t values (1)")
		if checkErr1 != nil && strings.Contains(checkErr1.Error(), "Index column") {
			checkErr2 = checkErr1
		}
	}
	dom.DDL().SetHook(hook)
	tk.MustExec("alter table t drop column `b7b8a741-2759-4111-a78c-66f85cad4b59`")
	require.NoError(t, checkErr2)

2. What did you expect to see? (Required)

Pass

3. What did you see instead (Required)

Index column b7b8a741-2759-4111-a78c-66f85cad4b59 offset out of bound, offset: 1, row: [KindFloat32 1]

4. What is your TiDB version? (Required)

master