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simple pig logic
 I have two datasets..
{"id":"foo", "some_field:12354, "score":0}
{"id":"foobar", "some_field:12354, "score":0}
{"id":"foo", "score":1}
So in main_data.. score is initialized to 0..
Also.. main_data and score_data have some ids in common..

For the ids which are common:
I want to replace "score" in main_data with score in score_data

And if the element is absent.. then I want to let the score to 0 itself..