Default value of memusage for skewed join is not correct
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                 Key: PIG-929
                 URL: https://issues.apache.org/jira/browse/PIG-929
             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 
distribution.

We need to implement the skewed join in pig.

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