Github user srowen commented on the issue:

    https://github.com/apache/spark/pull/18811
  
    Ah, I'm sorry I misled you a bit here @zuotingbing . Yes you found another 
unused variable, but, it's in code that is copied directly from Hive. I think 
we should leave HiveSessionImplwithUGI untouched. It makes it easier to patch 
it if we don't have custom changes.
    
https://github.com/apache/hive/blob/master/service/src/java/org/apache/hive/service/cli/session/HiveSessionImplwithUGI.java
    
    If you'll back that out, and this is the only other change you found, I'll 
merge it


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