Apache pig 用猪分组后如何分类袋组？

我把数据设置为

id company
1  a
1  b
2  c
2  a

我编写的代码如下： 记录=加载

grp = GROUP record BY id; 

newdata = FOREACH grp GENERATE group AS id, 
        COUNT(record) AS counts, 
        BagToTuple(record.company) AS company;

输出如下所示：

id count company
1  2     a,b
2  2     c,a

但我希望公司可以进行分类。例如，我需要a，c作为id 2。

使用嵌套的Foreach

newdata = FOREACH grp {
        sortedbag = order record by company;
        GENERATE group AS id,
        COUNT(sortedbag) AS counts,
        BagToTuple(sortedbag.company) AS company;
        };

其中sortedbag别名包含按公司升序排序的数据。如果要按降序排序，请将语句更改为

sortedbag = order record by company DESC;