soumyakanti3578 opened a new pull request #2163:
URL: https://github.com/apache/hive/pull/2163


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   ### What changes were proposed in this pull request?
   `SqlFunctionConverter.java` has been changed to make IS_DISTINCT_FROM 
operator go through the CBO.
   
   
   ### Why are the changes needed?
   Currently, insert statements are failing when IS DISTINCT FROM or IS NOT 
DISTINCT FROM operators are used, which can be fixed by simply optimizing 
through the CBO.
   
   
   ### Does this PR introduce _any_ user-facing change?
   NO
   
   
   ### How was this patch tested?
   Added tests to `is_distinct_from.q`, and validated the output.
   


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