@Override
      public SeekableInputStream newStream() throws IOException {
        return HadoopStreams.wrap(fs.open(file));
      }
The total number of rows this RecordReader will eventually read. The sum of the
rows of all the row groups.
ql/src/java/org/apache/hadoop/hive/ql/io/parquet/vector/VectorizedParquetRecordReader.java