话不多说，直接上代码
List<List> partition = new ArrayList<>();

select * from tableName where 1=1
<if test="partition != null and partition.size > 0">
            and
            <foreach collection="partition" item="item1" open="(" close=")" separator="or">
                t1.agency in
                <foreach collection="item1" item="item2" open="(" close=")" separator=",">
                    #{item2}
                </foreach>
            </foreach>

        </if>