@Override
  public boolean mkdirs(Path f, FsPermission permission) throws IOException {
    throw new UnsupportedOperationException("Not supported");
  }
The bogus filesystem that makes Hive not read files for nullscans via lies and deceit.
Relies on the fact that the input format doesn't actually have to touch the file.
Add method implementations if really needed.
ql/src/java/org/apache/hadoop/hive/ql/io/NullScanFileSystem.java