public int deleteFileOffset() {
    return deleteDataIterator.fileOffset();
  }
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