private void checkAccess() throws IOException {
      if (blockedUgi == null) return;
      if (!blockedUgi.equals(UserGroupInformation.getCurrentUser().getShortUserName())) return;
      throw new MockAccessDenied();
    }
WARNING: detele(Path...) don't actually delete
ql/src/test/org/apache/hadoop/hive/ql/io/orc/TestInputOutputFormat.java