Explain output sometimes may not match the exact plan that is executed in terms 
of the order in which inner plans and operators are presented - (semantically 
the plans are the same)

                 Key: PIG-848
                 URL: https://issues.apache.org/jira/browse/PIG-848
             Project: Pig
          Issue Type: Improvement
    Affects Versions: 0.2.1
            Reporter: Pradeep Kamath

The visitors used for explain and in MRCompiler do not guarantee order - hence 
the plan shown in explain output may not match the plan that is finally 
executed. This is not a bug but makes debugging harder. If the plan that is 
executed is different from the one in explain, it would still be the same in 
terms of semantics - the difference would only be in the order of inner plans 
and operators. It would be nice if we could have an order preserving way of 
showing explain output which would also be used to construct the plan (MRPlan) 
which is finally executed.

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