insert ignore may cause data and index inconsistency

[wjhuang2016]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

store, dom := testkit.CreateMockStoreAndDomain(t)

	tk := testkit.NewTestKit(t, store)
	tk.MustExec("use test")
	tk.MustExec("create table t(a smallint(6) DEFAULT '-13202', b varchar(221) NOT NULL DEFAULT '9k23s0uioddlcahb5qmd9mulds8hd6go0q6cxlsshbj3w9y08yuqcky1gv90eldi4ylbno8ofs15o2exlyka6vt653idyy84b0s8qxtnxq501', " +
		"c tinyint(1) NOT NULL DEFAULT '0', PRIMARY KEY (c, b));")

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

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

	d := dom.DDL()
	originalCallback := d.GetHook()
	defer d.SetHook(originalCallback)
	callback := &callback.TestDDLCallback{}
	//_, err := tk1.Exec("INSERT INTO t VALUES (-18585,'+zmNHMov7KF~tF*DFb',1), (-18585,'0',1), (-18585,'1',1), (-18585,'9k23s0uioddlcahb5qmd9mulds8hd6go0q6cxlsshbj3w9y08yuqcky1gv90eldi4ylbno8ofs15o2exlyka6vt653idyy84b0s8qxtnxq501',1), (-18585,'Q',1), (-18585,'s',1);;")
	//assert.NoError(t, err)

	onJobUpdatedExportedFunc := func(job *model.Job) {
		if t.Failed() {
			return
		}
		switch job.SchemaState {
		case model.StateDeleteOnly:
			_, err := tk1.Exec("INSERT INTO t VALUES (-18585,'+zmNHMov7KF~tF*DFb',1), (-18585,'0',1), (-18585,'1',1), (-18585,'9k23s0uioddlcahb5qmd9mulds8hd6go0q6cxlsshbj3w9y08yuqcky1gv90eldi4ylbno8ofs15o2exlyka6vt653idyy84b0s8qxtnxq501',1), (-18585,'Q',1), (-18585,'s',1);;")
			assert.NoError(t, err)
		case model.StateWriteReorganization:
			idx := testutil.FindIdxInfo(dom, "test", "t", "idx")
			if idx.BackfillState == model.BackfillStateReadyToMerge {
				_, err := tk1.Exec("insert ignore into `t`  values ( '06j$GwD*zizDUEEy&*-',null,-2028 ) ,( '((J)',0,17786 ) ,( 'SD$ruyO$%c',1,null ) ,( 'a3Ex',0,24877 ) ,( 'O=M',1,31913 ) ,( '7njQI*',0,17610 );")
				assert.NoError(t, err)
				return
			}
		}
	}
	callback.OnJobUpdatedExported.Store(&onJobUpdatedExportedFunc)
	d.SetHook(callback)

	tk.MustExec("alter table t add unique index idx(b);")
	tk.MustExec("admin check table t;")

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

test pass

3. What did you see instead (Required)

failed

4. What is your TiDB version? (Required)

master