Remove all of the expressions from bindings

        :param bindings: The bindings to clean
        :type bindings: list

        :return: The cleaned bindings
        :rtype: list

def _clean_bindings(self, bindings):
        """
        Remove all of the expressions from bindings

        :param bindings: The bindings to clean
        :type bindings: list

        :return: The cleaned bindings
        :rtype: list
        """
        return list(filter(lambda b: not isinstance(b, QueryExpression), bindings))