@Override
  public List<String> set_ugi(String username, List<String> groupNames) throws TException {
    Collections.addAll(groupNames, username);
    return groupNames;
  }
Check if newRole is in parent hierarchy of curRole
@param newRole
@param curRole
@return true if newRole is curRole or present in its hierarchy
@throws MetaException
standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/HMSHandler.java