Query regarding usage of Rank Function (PIG-2353)

[Yash Sharma <ya...@gmail.com>]

Hi All,
I am using rank function and generating ranks for every id in my data.
I need ranking of my data in a particular way. I want the rank to reset and
start from 1 for every new ID.

Is it possible to use the rank function directly for the same.
Any tips would be appreciated.

Data:

id,rating
X001, 9
X001, 9
X001, 8
X002, 9
X002, 7
X002, 6
X002, 5
X003, 8
X004, 8
X004, 7
X004, 7
X004, 4

On using rank function like:
op = rank data by id,score;

I get this output

rank,id,rating
1, X001, 9
1, X001, 9
2, X001, 8
3, X002, 9
4, X002, 7
5, X002, 6
6, X002, 5
7, X003, 8
8, X004, 8
9, X004, 7
9, X004, 7
10, X004, 4


Desired O/P:

rank,id,rating
1, X001, 9
1, X001, 9
2, X001, 8
1, X002, 9
2, X002, 7
3, X002, 6
4, X002, 5
1, X003, 8
1, X004, 8
2, X004, 7
2, X004, 7
3, X004, 4


Thanks,
Yash