NPE in PhysicalPlan clone operation
-----------------------------------

                 Key: PIG-735
                 URL: https://issues.apache.org/jira/browse/PIG-735
             Project: Pig
          Issue Type: Bug
            Reporter: Patrick Hunt


clone() operation in 
src/org/apache/pig/backend/hadoop/executionengine/physicalLayer/plans/PhysicalPlan.java
 can throws NPE rather than clone not supported

Note: this code fails to compile under eclipse with 1.6 target and "null 
pointer access" in java compiler
preference set to "error"


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