Github user yhuai commented on a diff in the pull request: https://github.com/apache/spark/pull/8909#discussion_r41457829 --- Diff: sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveQl.scala --- @@ -264,12 +262,16 @@ private[hive] object HiveQl extends Logging { * Returns the HiveConf */ private[this] def hiveConf: HiveConf = { - val ss = SessionState.get() // SessionState is lazy initialization, it can be null here + var ss = SessionState.get() + // SessionState is lazy initialization, it can be null here if (ss == null) { - new HiveConf() - } else { - ss.getConf + val original = Thread.currentThread().getContextClassLoader + val conf = new HiveConf(classOf[SessionState]) + conf.setClassLoader(original) + ss = new SessionState(conf) + SessionState.start(ss) --- End diff -- Actually, I guess we are fine. When we create a `HiveConf`, its internal classloader will be `Thread.currentThread().getContextClassLoader()`. So, we will not change the context classloader. But, it is better to have explicitly call `conf.setClassLoader` to set `original` as the classloader for this conf to avoid any confusion. What do you think?
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