def METHOD_NAME(*arg, **kw):
    """PostgreSQL-specific form of :class:`.array_agg`, ensures
    return type is :class:`.postgresql.ARRAY` and not
    the plain :class:`.types.ARRAY`.
    .. versionadded:: 1.1
    """
    kw['type_'] = ARRAY(functions._type_from_args(arg))
    return functions.func.METHOD_NAME(*arg, **kw)