MyBatis的xml判断List中是否包含某个字符串

<choose>
	<when test="cleanStatus != null and cleanStatus.size() == 1 and cleanStatus.contains('2'.toString())">
		order by update_time asc
	</when>
	<otherwise>
		order by clean_status asc
	</otherwise>
</choose>

xml中的字符串的判断必须加toString()方法才能生效。