Github user cloud-fan commented on a diff in the pull request:

    https://github.com/apache/spark/pull/20034#discussion_r158319646
  
    --- Diff: 
sql/hive/src/main/scala/org/apache/spark/sql/hive/client/HiveClientImpl.scala 
---
    @@ -186,7 +186,7 @@ private[hive] class HiveClientImpl(
       /** Returns the configuration for the current session. */
       def conf: HiveConf = state.getConf
     
    -  private val userName = state.getAuthenticator.getUserName
    --- End diff --
    
    Why this returns null?


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