Github user marmbrus commented on a diff in the pull request:

    https://github.com/apache/spark/pull/9589#discussion_r44709943
  
    --- Diff: 
sql/hive/src/main/scala/org/apache/spark/sql/hive/client/ClientWrapper.scala ---
    @@ -151,29 +152,34 @@ private[hive] class ClientWrapper(
         // Switch to the initClassLoader.
         Thread.currentThread().setContextClassLoader(initClassLoader)
         val ret = try {
    -      val initialConf = new HiveConf(classOf[SessionState])
    -      // HiveConf is a Hadoop Configuration, which has a field of 
classLoader and
    -      // the initial value will be the current thread's context class 
loader
    -      // (i.e. initClassLoader at here).
    -      // We call initialConf.setClassLoader(initClassLoader) at here to 
make
    -      // this action explicit.
    -      initialConf.setClassLoader(initClassLoader)
    -      config.foreach { case (k, v) =>
    -        if (k.toLowerCase.contains("password")) {
    -          logDebug(s"Hive Config: $k=xxx")
    -        } else {
    -          logDebug(s"Hive Config: $k=$v")
    +      val registeredState = SessionState.get
    +      if (registeredState != null && 
registeredState.isInstanceOf[CliSessionState]) {
    --- End diff --
    
    Note, it would be better if we didn't have to handle this specially.  It 
make the control flow even more confusing than it already is.


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