Github user JoshRosen commented on a diff in the pull request: https://github.com/apache/spark/pull/10061#discussion_r46248402 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/SQLContext.scala --- @@ -1263,6 +1264,8 @@ object SQLContext { */ @transient private val instantiatedContext = new AtomicReference[SQLContext]() + @transient private val sqlListener = new AtomicReference[SQLListener]() --- End diff -- Ah, I see that we need this in order to be able to return a value from `createListenerAndUI`.
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