fix merge

ddl/ddl.go

@@ -683,7 +683,7 @@ func newDDL(ctx context.Context, options ...Option) *ddl {
 	scheduler.RegisterTaskType(BackfillTaskType,
 		func(ctx context.Context, id string, taskID int64, taskTable scheduler.TaskTable, pool scheduler.Pool) scheduler.Scheduler {
 			return newBackfillDistScheduler(ctx, id, taskID, taskTable, pool, d)
-		},
+		}, scheduler.WithSummary,
 	)
 
 	backFillDsp, err := NewBackfillingDispatcherExt(d)