猪编程通过使用count（*）在组上使用拆分

Question

输入文件为：

2, cornflakes, Regular,General Mills, 12
3, cornflakes, Mixed Nuts, Post, 14
4, chocolate syrup, Regular, Hersheys, 5
5, chocolate syrup, No High Fructose, Hersheys, 8
6, chocolate syrup, Regular, Ghirardeli, 6
7, chocolate syrup, Strawberry Flavor, Ghirardeli, 7

filter3 = LOAD 'location_of_file' using PigStorage('\t') as (item_sl : int, item : chararray, type: chararray, manufacturer: chararray, price : int);

SPLIT filter3 INTO filter4 IF (FOREACH (filter3 GROUP BY item) GENERATE group, COUNT(item < 3)), filter6_pass OTHERWISE;

就像对带有count（*）<3的项进行分组的SQL一样

所需的输出是：

4, chocolate syrup, Regular, Hersheys, 5
5, chocolate syrup, No High Fructose, Hersheys, 8
6, chocolate syrup, Regular, Ghirardeli, 6
7, chocolate syrup, Strawberry Flavor, Ghirardeli, 7

Answer 1

按项目分组，获取计数，然后对计数使用过滤器

A = LOAD 'location_of_file' using PigStorage('\t') as (item_sl : int, item : chararray, type: chararray, manufacturer: chararray, price : int);
B = GROUP A BY item;
C = FOREACH B GENERATE group,COUNT(A.item) AS Total;
D = FILTER C BY Total > 3;
E = JOIN A BY item,D BY $0;
F = FOREACH E GENERATE $0..$4;
DUMP F;