@Override
    protected AuthenticatedFileIO getFileIO() {
      return fileIO;
    }
Read data by {@link CombinedIcebergScanTask} for optimizer of native iceberg. During the
execution of readData and readDeleteData, delete data is read only once, thereby improving
performance.
amoro-format-iceberg/src/main/java/org/apache/amoro/io/reader/GenericCombinedIcebergDataReader.java