@Override
    public FSDataInputStream open(Path path, int i) throws IOException {
      numOpenFileCalls++;
      statistics.incrementReadOps(1);
      System.out.println("STATS: open - " + path);
      checkAccess();
      MockFile file = findFile(path);
      if (file != null) return new FSDataInputStream(new MockInputStream(file));
      throw new FileNotFoundException("File not found: " + path);
    }
WARNING: detele(Path...) don't actually delete
ql/src/test/org/apache/hadoop/hive/ql/io/orc/TestInputOutputFormat.java