presto-hive/src/main/java/io/prestosql/plugin/hive/authentication/SimpleHadoopAuthentication.java/SimpleHadoopAuthentication/getUserGroupInformation
class SimpleHadoopAuthentication:    @Override
    public UserGroupInformation getUserGroupInformation()
    {
        try {
            return UserGroupInformation.getLoginUser();
        }
        catch (IOException e) {
            throw new UncheckedIOException(e);
        }
    }