public function supportsExtensions($extensions = array('partitions', 'tablespaces', 'clustering'))
    {
        if (isset($extensions['partitions'])) {
            return false;
        } elseif (isset($extensions['tablespaces'])) {
            return false;
        } elseif (isset($extensions['clustering'])) {
            return false;
        } else {
            return false;
        }
    }