lightning: save NEXT_GLOBAL_ROW_ID as uint64 instead of int64 (pingca…

…p#45614) (pingcap#45940)

close pingcap#45427

br/pkg/lightning/backend/tidb/tidb.go

@@ -782,7 +782,7 @@ func (*Writer) IsSynced() bool {
 // TableAutoIDInfo is the auto id information of a table.
 type TableAutoIDInfo struct {
 	Column string
-	NextID int64
+	NextID uint64
 	Type   string
 }
 
@@ -796,7 +796,7 @@ func FetchTableAutoIDInfos(ctx context.Context, exec utils.QueryExecutor, tableN
 	for rows.Next() {
 		var (
 			dbName, tblName, columnName, idType string
-			nextID                              int64
+			nextID                              uint64
 		)
 		columns, err := rows.Columns()
 		if err != nil {
@@ -809,7 +809,7 @@ func FetchTableAutoIDInfos(ctx context.Context, exec utils.QueryExecutor, tableN
 		//| testsysbench | t          | _tidb_rowid |                  1 | AUTO_INCREMENT |
 		//+--------------+------------+-------------+--------------------+----------------+
 
-		// if columns length is 4, it doesn't contains the last column `ID_TYPE`, and it will always be 'AUTO_INCREMENT'
+		// if columns length is 4, it doesn't contain the last column `ID_TYPE`, and it will always be 'AUTO_INCREMENT'
 		// for v4.0.0~v4.0.2 show table t next_row_id only returns 4 columns.
 		if len(columns) == 4 {
 			err = rows.Scan(&dbName, &tblName, &columnName, &nextID)

br/pkg/lightning/backend/tidb/tidb_test.go

@@ -328,7 +328,7 @@ func TestFetchRemoteTableModels_4_0(t *testing.T) {
 			AddRow("t", "id", "bigint(20) unsigned", "", "auto_increment"))
 	s.mockDB.ExpectQuery("SHOW TABLE `test`.`t` NEXT_ROW_ID").
 		WillReturnRows(sqlmock.NewRows([]string{"DB_NAME", "TABLE_NAME", "COLUMN_NAME", "NEXT_GLOBAL_ROW_ID"}).
-			AddRow("test", "t", "id", int64(1)))
+			AddRow("test", "t", "id", "10942694589135710585"))
 	s.mockDB.ExpectCommit()
 
 	targetInfoGetter := tidb.NewTargetInfoGetter(s.dbHandle)