@Override
  public RowData next() {
    return iterator.next();
  }
Iterator for reading data in a Merge on Read (MOR) way. This iterator handles reading data from
an Amoro mix-format table while keeping track of file and record offsets for efficient data
retrieval.
amoro-format-mixed/amoro-mixed-flink/amoro-mixed-flink-common/src/main/java/org/apache/amoro/flink/read/source/MergeOnReadDataIterator.java