script1-hadoop.pig in pig tutorial hangs when run in local mode

                 Key: PIG-800
             Project: Pig
          Issue Type: Bug
    Affects Versions: 0.2.0
            Reporter: Alan Gates
            Assignee: Alan Gates

Any script of the form

B = foreach A generate flatten(X); -- X is a bag
C = distinct B;

where X is sometimes an empty bag will hang in local mode.  If distinct is 
replaced by order by it will also hang.

The issue is that the flatten in foreach returns STATUS_NULL whenever the bag X 
is empty.  PODistinct and POSort handle this incorrectly and go into an 
infinite loop.

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