HeartSaVioR commented on a change in pull request #26201: [SPARK-29543][SS][UI] 
Init structured streaming ui
URL: https://github.com/apache/spark/pull/26201#discussion_r365654786
 
 

 ##########
 File path: 
sql/core/src/main/scala/org/apache/spark/sql/streaming/StreamingQueryManager.scala
 ##########
 @@ -68,6 +69,9 @@ class StreamingQueryManager private[sql] (sparkSession: 
SparkSession) extends Lo
         logInfo(s"Registered listener ${listener.getClass.getName}")
       })
     }
+    if (sparkSession.sparkContext.conf.get(UI_ENABLED)) {
 
 Review comment:
   `UI_ENABLED` is being checked twice, and `.get` is called anyway, defeating 
the purpose of Option.
   
   This would behave similar but checks UI_ENABLED only once and leverages 
Option properly.
   ```
   sparkSession.sharedState.streamingQueryStatusListener.foreach { listener =>
     addListener(listener)
   }
   ```

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