presto-hive/src/main/java/io/prestosql/plugin/hive/authentication/KerberosHadoopAuthentication.java/KerberosHadoopAuthentication/getUserGroupInformation
class KerberosHadoopAuthentication:    @Override
    public UserGroupInformation getUserGroupInformation()
    {
        Subject subject = kerberosAuthentication.getSubject();
        return createUserGroupInformationForSubject(subject);
    }