It's better for POPartitionRearrange to use List instead of DataBag to hold 
duplicated tuples for partitioned keys
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                 Key: PIG-1225
                 URL: https://issues.apache.org/jira/browse/PIG-1225
             Project: Pig
          Issue Type: Improvement
            Reporter: Ying He


In POPartionRearrange, a tuple from streaming table is duplicated multiple 
times to send to reducers that partion table is partioned into. It uses 
DefaultDataBag right now, it would be better to use java List.

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