如何在列表中不同的值存储使用猪

Question

相同的键我有一个用例

col1|col2 
a101|10 
a101|20 
a101|10 
a101|30 
a201|40 
a201|50 

预期输出：

A101 |列表< 10,20,30>

a201 |列表< 40,50>

下面是查询，但我没有得到预期的输出。我想在列表中存储col2不同的值。

input1= load 'list1.csv' using PigStorage('|') as (col1: chararray, col2: int); 
input2 = DISTINCT (FOREACH input1 generate col1,col2); 
input3 = GROUP input2 by col1; 
dump input3; 
(a101,{(a101,30),(a101,20),(a101,10)}) 
(a201,{(a201,50),(a201,40)}) 

Answer 1

试试这个：

input1= load 'input.txt' using PigStorage('|') as (col1: chararray, col2: int); 
input2 = DISTINCT input1; --distinct not required but will remove duplicate rows 
input3 = GROUP input2 by col1; 
data = FOREACH input3 GENERATE FLATTEN(group) as col1, input2.col2 AS col2; 
DUMP data; 

输出生成：

(a101,{(30),(20),(10)}) 
(a201,{(50),(40)})