apache pig - Count the grouped records in pig query -


below test data.

john,q1,correct jack,q1,wrong john,q2,correct jack,q2,wrong john,q3,wrong jack,q3,correct john,q4,wrong jack,q4,wrong john,q5,wrong jack,q5,wrong

i want find below: 

john wrong  4 john correct 1 jack wrong  3 jack correct 2

my code:

data = load '/stackoverflowq4.txt' using pigstorage(',') (        name:chararray,         number:chararray,        result:chararray); b = group data (name,result);

now out put looks below: 

((john,wrong),{(john,q5,wrong),(john,q4,wrong),(john,q2,wrong),(john,q1,wrong)}) ((john,correct),{(john,q3,correct)}) ((jack,wrong),{(jack,q5,wrong),(jack,q4,wrong),(jack,q3,wrong)}) ((jack,correct),{(jack,q2,correct),(jack,q1,correct)})

how should calculate count grouped records.

the count function give number of elements in bag, want. after grouping user , result, end bag number of times each combination appeared.

therefore, have add 1 line:

data = load '/stackoverflowq4.txt' using pigstorage(',') (    name:chararray,     number:chararray,    result:chararray); b = group data (name,result); c = foreach b generate flatten(group) (name,result), count(data) count;  dump d; (jack,wrong,4) (jack,correct,1) (john,wrong,3) (john,correct,2)

the flatten(group) because after grouping, tuple containing elements grouped generated, , looks of want output don't want inside tuple, output ((jack,wrong),4).


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