@Override
  public long getPos() {
    return -1;
  }
Basically an MR1 API implementing wrapper for transferring VectorizedRowBatch's produced by
IcebergInputformat$IcebergRecordReader which relies on the MR2 API format.
iceberg/iceberg-handler/src/main/java/org/apache/iceberg/mr/hive/vector/HiveIcebergVectorizedRecordReader.java