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

    https://github.com/apache/spark/pull/21438#discussion_r191285757
  
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/execution/ui/SQLAppStatusListener.scala
 ---
    @@ -159,7 +159,7 @@ class SQLAppStatusListener(
       }
     
       private def aggregateMetrics(exec: LiveExecutionData): Map[Long, String] 
= {
    -    val metricIds = exec.metrics.map(_.accumulatorId).sorted
    +    val metricIds = exec.metrics.map(_.accumulatorId).toSet
    --- End diff --
    
    I think we can get rid of `metricIds `


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