null should be handled consistently in Join

                 Key: PIG-927
             Project: Pig
          Issue Type: Bug
    Affects Versions: 0.3.0
            Reporter: Pradeep Kamath

Currenlty Pig mostly follows SQL semantics for handling null. However there are 
certain cases where pig may need to handle nulls correctly. One example is the 
join - joins on single keys results in null keys not matching to produce an 
output. However if the join is on >1 keys, in the key tuple, if one of the 
values is null, it still matches with another key tuple which has a null for 
that value. We need to decide the right semantics here. 

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