@Override
  public void readFully(ByteBuffer arg0) throws IOException {
    read(arg0);
  }
The Parquet InputFile implementation that allows the reader to
read the footer from cache without being aware of the latter.
This implements both InputFile and the InputStream that the reader gets from InputFile.
ql/src/java/org/apache/hadoop/hive/ql/io/parquet/vector/ParquetFooterInputFromCache.java