Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/10061#discussion_r46245537
--- 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 --
Just to make sure that it's not overlooked, please see my comment on the
other PRs regarding whether this needs to actually hold a `SQLListener`
instance or whether it can simply be an `AtomicBoolean`.
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