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

    https://github.com/apache/spark/pull/12388#discussion_r59923261
  
    --- Diff: 
core/src/main/scala/org/apache/spark/ui/jobs/JobProgressListener.scala ---
    @@ -434,50 +434,50 @@ class JobProgressListener(conf: SparkConf) extends 
SparkListener with Logging {
         val execSummary = stageData.executorSummary.getOrElseUpdate(execId, 
new ExecutorSummary)
     
         val shuffleWriteDelta =
    -      (taskMetrics.shuffleWriteMetrics.map(_.bytesWritten).getOrElse(0L)
    -      - 
oldMetrics.flatMap(_.shuffleWriteMetrics).map(_.bytesWritten).getOrElse(0L))
    +      taskMetrics.shuffleWriteMetrics.bytesWritten
    +        - oldMetrics.map(_.shuffleWriteMetrics.bytesWritten).getOrElse(0L)
         stageData.shuffleWriteBytes += shuffleWriteDelta
         execSummary.shuffleWrite += shuffleWriteDelta
     
         val shuffleWriteRecordsDelta =
    -      (taskMetrics.shuffleWriteMetrics.map(_.recordsWritten).getOrElse(0L)
    -      - 
oldMetrics.flatMap(_.shuffleWriteMetrics).map(_.recordsWritten).getOrElse(0L))
    +      taskMetrics.shuffleWriteMetrics.recordsWritten
    +        - 
oldMetrics.map(_.shuffleWriteMetrics.recordsWritten).getOrElse(0L)
         stageData.shuffleWriteRecords += shuffleWriteRecordsDelta
         execSummary.shuffleWriteRecords += shuffleWriteRecordsDelta
     
         val shuffleReadDelta =
    -      (taskMetrics.shuffleReadMetrics.map(_.totalBytesRead).getOrElse(0L)
    -        - 
oldMetrics.flatMap(_.shuffleReadMetrics).map(_.totalBytesRead).getOrElse(0L))
    +      taskMetrics.shuffleReadMetrics.totalBytesRead
    +        - oldMetrics.map(_.shuffleReadMetrics.totalBytesRead).getOrElse(0L)
    --- End diff --
    
    oh come on... no one likes mandatory semi-colons right? 😜 
    
    Does this case not even generate a warning?  I guess it doesn't know your 
`.map` is a pure expression.


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