[GitHub] [spark] gengliangwang commented on a change in pull request #28781: [SPARK-31953][SS] Add Spark Structured Streaming History Server Support

[GitBox <gi...@apache.org>]

gengliangwang commented on a change in pull request #28781:
URL: https://github.com/apache/spark/pull/28781#discussion_r444572776



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File path: sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/StreamingQueryListenerBus.scala
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@@ -35,12 +35,12 @@ import org.apache.spark.util.ListenerBus
  * and StreamingQueryManager. So this bus will dispatch events to registered listeners for only
  * those queries that were started in the associated SparkSession.
  */
-class StreamingQueryListenerBus(sparkListenerBus: LiveListenerBus)
+class StreamingQueryListenerBus(sparkListenerBus: Option[LiveListenerBus])

Review comment:
       @uncleGen Could you update the comment for `StreamingQueryListenerBus`?




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