public void put(T nextRow, ChangeAction changeAction, Long nextOffset) {
      this.nextRow = nextRow;
      this.changeAction = changeAction;
      this.nextOffset = nextOffset;
    }
This is a change log data iterator that replays the change log data appended to mixed-format
change table with ordered.
amoro-format-mixed/amoro-mixed-flink/amoro-mixed-flink-common/src/main/java/org/apache/amoro/flink/read/source/ChangeLogDataIterator.java