PIG集团以独特的价值成为包包

Question

recipe,ingredient,inventor
Tacos,Beef,Alex
Tacos,Lettuce,Alex
Tacos,Cheese,Alex
TomatoSoup,Tomatoes,Steve
TomatoSoup,Milk,Steve

我想按照食谱对记录进行分组，并将成分和发明者包装起来

(Tacos,{Beef,Lettuce,Cheese},Alex)
(TomatoSoup,{Tomatoes,Milk},Steve)

Answer 1

按配方和发明人分组，然后根据您的要求订购列。

A = LOAD 'data.txt' USING PigStorage(',') AS (recipe:chararray,ingredient:chararray,inventor:chararray);
B = GROUP A BY (recipe,inventory);
C = FOREACH B GENERATE FLATTEN(group) as (recipe,inventor),A.ingredient;
D = FOREACH C GENERATE recipe,ingredient,inventory;
DUMP D;