Github user andrewor14 commented on a diff in the pull request:

    https://github.com/apache/spark/pull/13264#discussion_r64453178
  
    --- Diff: core/src/main/scala/org/apache/spark/ui/storage/StorageTab.scala 
---
    @@ -59,7 +59,15 @@ class StorageListener(storageStatusListener: 
StorageStatusListener) extends Bloc
     
       override def onStageSubmitted(stageSubmitted: 
SparkListenerStageSubmitted): Unit = synchronized {
         val rddInfos = stageSubmitted.stageInfo.rddInfos
    -    rddInfos.foreach { info => _rddInfoMap.getOrElseUpdate(info.id, info) }
    +    rddInfos.foreach { info =>
    +      _rddInfoMap.get(info.id) match {
    +        case Some(rddInfo) if info.name != rddInfo.name =>
    +          rddInfo.name = info.name
    +        case None =>
    +          _rddInfoMap(info.id) = info
    +        case _ =>
    --- End diff --
    
    `map.get` returns an Option, which must be either `Some(...)` or `None`. 
The case where the `RDDInfo` didn't exist before falls under the `None` case. 
We'll never hit `case _ =>`.


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