Used the following codes:
ev, err := streamer.GetEvent(contx)
event := ev.Event.(*replication.RowsEvent)
when ev.Header.EventType is replication.WRITE_ROWS_EVENTv1 or replication.WRITE_ROWS_EVENTv2，in most cases, the event.Rows have values, but in few cases in test environment, the event.Rows's length is 0 or nil when the ev.Header.EventType is replication.WRITE_ROWS_EVENTv1 or replication.WRITE_ROWS_EVENTv2. is it normal case?