Pig Latin 像这样获取 SUM() 函数的输出？

Question

我有一些数据，比如（名字，分数）一个 10 乙 25 C 15 一个 5 一个 36 乙98 C 78 C 78 B 12

data = LOAD 'demo.txt'  using PigStorage (',') as (name : chararray , score : int);
groupScore = GROUP data by score;
totalscore = FOREACH groupScore Generate data.name , SUM(data.score);

当我使用 SUM() 函数时，输出类似于

{(A)(A)(A), (51)} 
{(B)(B)(B), (135)}

我想知道有没有我可以展示的东西

{(A), (51)},

这不是在每次出现时都重复 "name" 字段吗？
任何指导都会有所帮助。

Answer 1

按名称分组

data = LOAD 'demo.txt'  as PigStorage (',') using (name : chararray , score : int);
groupScore = GROUP data by name;
totalscore = FOREACH groupScore Generate data.name , SUM(data.score);

Answer 2

下面是解决方案的查询

data = LOAD 'demo.txt' USING PigStorage(',') AS (name:chararray,score:int);
groupScore = group data by name;
result= FOREACH groupScore GENERATE group,SUM(data.score);

输出

(A,51) (B,135) (C,171)

Pig Latin 像这样获取 SUM() 函数的输出？

Pig Latin to get output for SUM() function like this?

hadoop

mapreduce

apache-pig