@Override
  public void write(DataOutput dataOutput) throws IOException {
    dataOutput.writeLong(writeId);
    dataOutput.writeInt(bucketId);
    dataOutput.writeLong(rowId);
  }
What was the original row id for the last row?
@return the row id
ql/src/java/org/apache/hadoop/hive/ql/io/RecordIdentifier.java