Push up filter does not account for added columns in foreach

                 Key: PIG-877
                 URL: https://issues.apache.org/jira/browse/PIG-877
             Project: Pig
          Issue Type: Bug
    Affects Versions: 0.3.1
            Reporter: Santhosh Srinivasan
             Fix For: 0.3.1

If a filter follows a foreach that produces an added column then push up filter 
fails with a null pointer exception.

x = foreach w generate $0, COUNT($1);
y = filter x by $1 > 10;

In the above example, the column in the filter's expression is an added column. 
As a result, the optimizer rule is not able to map it back to the input 
resulting in a null value. The subsequent for loop is failing due to NPE.

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