@Override
  public FileStatus[] listStatus(Path f) throws FileNotFoundException, IOException {
    return new FileStatus[] { new FileStatus(0, false, 0, 0, 0, new Path(f, "null")) };
  }
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