When POUnion is one of the roots of a map plan, POUnion.getNext() gives a null 
pointer exception

                 Key: PIG-634
                 URL: https://issues.apache.org/jira/browse/PIG-634
             Project: Pig
          Issue Type: Bug
    Affects Versions: types_branch
            Reporter: Pradeep Kamath
            Assignee: Pradeep Kamath
             Fix For: types_branch

POUnion.getnext() gives a null pointer exception in the following scenario 
(pasted from a code comment explaining the fix for this issue). If a script 
results in a plan like the one below, currently POUnion.getNext() gives a null 
pointer exception
                // POUnion
                // |
                // |--POLocalRearrange
                // |    |
                // |    |-POUnion (root 2)--> This union's getNext() can lead 
the code here
                // |
                // |--POLocalRearrange (root 1)
                // The inner POUnion above is a root in the plan which has 2 
                // So these 2 roots would have input coming from different input
                // sources (dfs files). So certain maps would be working on 
input only
                // meant for "root 1" above and some maps would work on input
                // meant only for "root 2". In the former case, "root 2" would
                // neither get input attached to it nor does it have 

A script which can cause a plan like above is:
a = load 'xyz'; 
b = load 'abc'; 
c = union a,b; 
d = load 'def'; 
e = cogroup c by $0 inner , d by $0 inner;
dump e;

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