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

    https://github.com/apache/spark/pull/21504#discussion_r193603810
  
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/streaming/StreamingQueryManager.scala
 ---
    @@ -55,6 +56,12 @@ class StreamingQueryManager private[sql] (sparkSession: 
SparkSession) extends Lo
       @GuardedBy("awaitTerminationLock")
       private var lastTerminatedQuery: StreamingQuery = null
     
    +  sparkSession.sparkContext.conf.get(STREAMING_QUERY_LISTENERS)
    +  .foreach { classNames =>
    --- End diff --
    
    nit:
    
    ```scala
    sparkSession.sparkContext.conf.get(STREAMING_QUERY_LISTENERS).foreach { 
classNames =>
      ...
    }
    ```



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