Skewed join generates  incorrect results 

                 Key: PIG-955
             Project: Pig
          Issue Type: Improvement
            Reporter: Ying He

Fragmented replicated join has a few limitations:
 - One of the tables needs to be loaded into memory
 - Join is limited to two tables

Skewed join partitions the table and joins the records in the reduce phase. It 
computes a histogram of the key space to account for skewing in the input 
records. Further, it adjusts the number of reducers depending on the key 

We need to implement the skewed join in pig.

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