Mybatis resultMap实现按某列字段统计 获取另一列该列字段及另一列list集合

    <resultMap id="***ResultMap" type="GroupDO">
      <id column="source_id" jdbcType="BIGINT" property="sourceId"/>
      <collection property="bIdList" ofType="Long" javaType="ArrayList">
          <result column="b_id"/>
      </collection>
    </resultMap>

    <sql id="SourceBuGroup_Column_List">
   source_id,b_id
    </sql>

public class GroupDO implements Serializable {


    private Long sourceId;

    private List<Long> bIdList;


}