猪如何通过其中一个袋值来排序元组

Question

我的数据集结构如下：{movie:chararry, year:int, weight:float, actor:chararray}

我试图找出每年权重最高的举动。所以我按年份和电影分组，然后我得到了以下一组：

{group: (year:int, movie:chararray), movies:{(movie:chararry, year:int, weight:float, actor:chararray)}}

我的问题是如何根据行李箱值，重量？对货架进行分类？谢谢

Answer 1

您可以在FOREACH中使用嵌套语句。

inpt = load '...../data.csv' using PigStorage(',') as (movie:chararry, year:int, weight:float, actor:chararray);

grp = group inpt by (year, movie);

srt = foreach grp {
    by_wright = ORDER inpt BY weight;
    generate group, by_wright;
};