executor: fix panic and update error data when table has column in wr…

…ite only state (pingcap#8792)

ddl/db_test.go

@@ -3652,3 +3652,174 @@ func getPartitionTableRecordsNum(c *C, ctx sessionctx.Context, tbl table.Partiti
 	}
 	return num
 }
+
+func (s *testDBSuite) TestTransactionOnAddDropColumn(c *C) {
+	s.tk = testkit.NewTestKit(c, s.store)
+	s.mustExec(c, "use test_db")
+	s.mustExec(c, "drop table if exists t1")
+	s.mustExec(c, "create table t1 (a int, b int);")
+	s.mustExec(c, "create table t2 (a int, b int);")
+	s.mustExec(c, "insert into t2 values (2,0)")
+
+	transactions := [][]string{
+		{
+			"begin",
+			"insert into t1 set a=1",
+			"update t1 set b=1 where a=1",
+			"commit",
+		},
+		{
+			"begin",
+			"insert into t1 select a,b from t2",
+			"update t1 set b=2 where a=2",
+			"commit",
+		},
+	}
+
+	originHook := s.dom.DDL().GetHook()
+	defer s.dom.DDL().(ddl.DDLForTest).SetHook(originHook)
+	hook := &ddl.TestDDLCallback{}
+	hook.OnJobRunBeforeExported = func(job *model.Job) {
+		switch job.SchemaState {
+		case model.StateWriteOnly, model.StateWriteReorganization, model.StateDeleteOnly, model.StateDeleteReorganization:
+		default:
+			return
+		}
+		// do transaction.
+		for _, transaction := range transactions {
+			for _, sql := range transaction {
+				s.mustExec(c, sql)
+			}
+		}
+	}
+	s.dom.DDL().(ddl.DDLForTest).SetHook(hook)
+	done := make(chan error, 1)
+	// test transaction on add column.
+	go backgroundExec(s.store, "alter table t1 add column c int not null after a", done)
+	err := <-done
+	c.Assert(err, IsNil)
+	s.tk.MustQuery("select a,b from t1 order by a").Check(testkit.Rows("1 1", "1 1", "1 1", "2 2", "2 2", "2 2"))
+	s.mustExec(c, "delete from t1")
+
+	// test transaction on drop column.
+	go backgroundExec(s.store, "alter table t1 drop column c", done)
+	err = <-done
+	c.Assert(err, IsNil)
+	s.tk.MustQuery("select a,b from t1 order by a").Check(testkit.Rows("1 1", "1 1", "1 1", "2 2", "2 2", "2 2"))
+}
+
+func (s *testDBSuite) TestTransactionWithWriteOnlyColumn(c *C) {
+	s.tk = testkit.NewTestKit(c, s.store)
+	s.mustExec(c, "use test_db")
+	s.mustExec(c, "drop table if exists t1")
+	s.mustExec(c, "create table t1 (a int key);")
+
+	transactions := [][]string{
+		{
+			"begin",
+			"insert into t1 set a=1",
+			"update t1 set a=2 where a=1",
+			"commit",
+		},
+	}
+
+	originHook := s.dom.DDL().GetHook()
+	defer s.dom.DDL().(ddl.DDLForTest).SetHook(originHook)
+	hook := &ddl.TestDDLCallback{}
+	hook.OnJobRunBeforeExported = func(job *model.Job) {
+		switch job.SchemaState {
+		case model.StateWriteOnly:
+		default:
+			return
+		}
+		// do transaction.
+		for _, transaction := range transactions {
+			for _, sql := range transaction {
+				s.mustExec(c, sql)
+			}
+		}
+	}
+	s.dom.DDL().(ddl.DDLForTest).SetHook(hook)
+	done := make(chan error, 1)
+	// test transaction on add column.
+	go backgroundExec(s.store, "alter table t1 add column c int not null", done)
+	err := <-done
+	c.Assert(err, IsNil)
+	s.tk.MustQuery("select a from t1").Check(testkit.Rows("2"))
+	s.mustExec(c, "delete from t1")
+
+	// test transaction on drop column.
+	go backgroundExec(s.store, "alter table t1 drop column c", done)
+	err = <-done
+	c.Assert(err, IsNil)
+	s.tk.MustQuery("select a from t1").Check(testkit.Rows("2"))
+}
+
+func (s *testDBSuite) TestAddColumn2(c *C) {
+	s.tk = testkit.NewTestKit(c, s.store)
+	s.mustExec(c, "use test_db")
+	s.mustExec(c, "drop table if exists t1")
+	s.mustExec(c, "create table t1 (a int key, b int);")
+	defer s.mustExec(c, "drop table if exists t1, t2")
+
+	originHook := s.dom.DDL().GetHook()
+	defer s.dom.DDL().(ddl.DDLForTest).SetHook(originHook)
+	hook := &ddl.TestDDLCallback{}
+	var writeOnlyTable table.Table
+	hook.OnJobRunBeforeExported = func(job *model.Job) {
+		if job.SchemaState == model.StateWriteOnly {
+			writeOnlyTable, _ = s.dom.InfoSchema().TableByID(job.TableID)
+		}
+	}
+	s.dom.DDL().(ddl.DDLForTest).SetHook(hook)
+	done := make(chan error, 1)
+	// test transaction on add column.
+	go backgroundExec(s.store, "alter table t1 add column c int not null", done)
+	err := <-done
+	c.Assert(err, IsNil)
+
+	s.mustExec(c, "insert into t1 values (1,1,1)")
+	s.tk.MustQuery("select a,b,c from t1").Check(testkit.Rows("1 1 1"))
+
+	// mock for outdated tidb update record.
+	c.Assert(writeOnlyTable, NotNil)
+	ctx := context.Background()
+	err = s.tk.Se.NewTxn(ctx)
+	c.Assert(err, IsNil)
+	oldRow, err := writeOnlyTable.RowWithCols(s.tk.Se, 1, writeOnlyTable.WritableCols())
+	c.Assert(err, IsNil)
+	c.Assert(len(oldRow), Equals, 3)
+	err = writeOnlyTable.RemoveRecord(s.tk.Se, 1, oldRow)
+	c.Assert(err, IsNil)
+	_, err = writeOnlyTable.AddRecord(s.tk.Se, types.MakeDatums(oldRow[0].GetInt64(), 2, oldRow[2].GetInt64()),
+		&table.AddRecordOpt{IsUpdate: true})
+	c.Assert(err, IsNil)
+	err = s.tk.Se.StmtCommit()
+	c.Assert(err, IsNil)
+	err = s.tk.Se.CommitTxn(ctx)
+
+	s.tk.MustQuery("select a,b,c from t1").Check(testkit.Rows("1 2 1"))
+
+	// Test for _tidb_rowid
+	var re *testkit.Result
+	s.mustExec(c, "create table t2 (a int);")
+	hook.OnJobRunBeforeExported = func(job *model.Job) {
+		if job.SchemaState != model.StateWriteOnly {
+			return
+		}
+		// allow write _tidb_rowid first
+		s.mustExec(c, "set @@tidb_opt_write_row_id=1")
+		s.mustExec(c, "begin")
+		s.mustExec(c, "insert into t2 (a,_tidb_rowid) values (1,2);")
+		re = s.tk.MustQuery(" select a,_tidb_rowid from t2;")
+		s.mustExec(c, "commit")
+
+	}
+	s.dom.DDL().(ddl.DDLForTest).SetHook(hook)
+
+	go backgroundExec(s.store, "alter table t2 add column b int not null default 3", done)
+	err = <-done
+	c.Assert(err, IsNil)
+	re.Check(testkit.Rows("1 2"))
+	s.tk.MustQuery("select a,b,_tidb_rowid from t2").Check(testkit.Rows("1 3 2"))
+}

executor/write.go

@@ -141,7 +141,7 @@ func updateRecord(ctx sessionctx.Context, h int64, oldData, newData []types.Datu
 		}
 		// the `affectedRows` is increased when adding new record.
 		newHandle, err = t.AddRecord(ctx, newData,
-			&table.AddRecordOpt{CreateIdxOpt: table.CreateIdxOpt{SkipHandleCheck: sc.DupKeyAsWarning}})
+			&table.AddRecordOpt{CreateIdxOpt: table.CreateIdxOpt{SkipHandleCheck: sc.DupKeyAsWarning}, IsUpdate: true})
 		if err != nil {
 			return false, false, 0, errors.Trace(err)
 		}

table/table.go

@@ -89,6 +89,7 @@ type RecordIterFunc func(h int64, rec []types.Datum, cols []*Column) (more bool,
 // AddRecordOpt contains the options will be used when adding a record.
 type AddRecordOpt struct {
 	CreateIdxOpt
+	IsUpdate bool
 }
 
 // Table is used to retrieve and modify rows in table.

table/tables/tables.go

@@ -417,7 +417,10 @@ func (t *tableCommon) AddRecord(ctx sessionctx.Context, r []types.Datum, opts ..
 	}
 	var hasRecordID bool
 	cols := t.Cols()
-	if len(r) > len(cols) {
+	// opt.IsUpdate is a flag for update.
+	// If handle ID is changed when update, update will remove the old record first, and then call `AddRecord` to add a new record.
+	// Currently, only insert can set _tidb_rowid, update can not update _tidb_rowid.
+	if len(r) > len(cols) && !opt.IsUpdate {
 		// The last value is _tidb_rowid.
 		recordID = r[len(r)-1].GetInt64()
 		hasRecordID = true
@@ -464,12 +467,21 @@ func (t *tableCommon) AddRecord(ctx sessionctx.Context, r []types.Datum, opts ..
 
 	for _, col := range t.WritableCols() {
 		var value types.Datum
-		if col.State != model.StatePublic {
+		// Update call `AddRecord` will already handle the write only column default value.
+		// Only insert should add default value for write only column.
+		if col.State != model.StatePublic && !opt.IsUpdate {
 			// If col is in write only or write reorganization state, we must add it with its default value.
 			value, err = table.GetColOriginDefaultValue(ctx, col.ToInfo())
 			if err != nil {
 				return 0, errors.Trace(err)
 			}
+			// add value to `r` for dirty db in transaction.
+			// Otherwise when update will panic cause by get value of column in write only state from dirty db.
+			if col.Offset < len(r) {
+				r[col.Offset] = value
+			} else {
+				r = append(r, value)
+			}
 		} else {
 			value = r[col.Offset]
 		}