v = []

    def visit_bindparam(bind):

        value = query._params.get(bind.key, bind.value)

        # lazyloader may dig a callable in here, intended

        # to late-evaluate params after autoflush is called.

        # convert to a scalar value.

        v.append(value)

    if query._criterion is not None:

        visitors.traverse(query._criterion, {}, {'bindparam':visit_bindparam})

    return v