@Override
  public void close() throws IOException {
    if (cacheFsPath != null) {
      LlapCacheAwareFs.unregisterFile(cacheFsPath);
    }
    if (reader != null) {
      reader.close();
    }
  }
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