@Override
  protected ParquetMetadata getParquetMetadata(Path path, JobConf conf) throws IOException {
    return readSplitFooter(conf, filePath, cacheKey, NO_FILTER, cacheTag);
  }
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