getFieldSchema() in ExpressionOperators also sets up lineage information - this 
can cause issues if getFieldSchema() is called too early

                 Key: PIG-808
             Project: Pig
          Issue Type: Bug
    Affects Versions: 0.2.1
            Reporter: Pradeep Kamath
             Fix For: 0.3.0

See PIG-804 for a use case which exposes this bug. We should probably be 
setting up lineage information outside getFieldSchema() through a visitor at a 
point where we know it is safe - (just before TypeCheckingVisitor?). 

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