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

    https://github.com/apache/spark/pull/8931#discussion_r41419650
  
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/execution/aggregate/TungstenAggregate.scala
 ---
    @@ -69,6 +72,9 @@ case class TungstenAggregate(
       protected override def doExecute(): RDD[InternalRow] = attachTree(this, 
"execute") {
         val numInputRows = longMetric("numInputRows")
         val numOutputRows = longMetric("numOutputRows")
    +    val totalPeakMemory = longMetric("totalPeakMemory")
    +    val maxPeakMemory = longMetric("maxPeakMemory")
    --- End diff --
    
    max and peak are redundant.  maxTaskMemory? maxPerTaskMemory?


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