Github user cloud-fan commented on a diff in the pull request:

    https://github.com/apache/spark/pull/21754#discussion_r207188779
  
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/execution/exchange/ExchangeCoordinator.scala
 ---
    @@ -83,16 +83,17 @@ import org.apache.spark.sql.execution.{ShuffledRowRDD, 
SparkPlan}
      *  - post-shuffle partition 3: pre-shuffle partition 3 and 4 (size 50 MB)
      */
     class ExchangeCoordinator(
    -    numExchanges: Int,
         advisoryTargetPostShuffleInputSize: Long,
         minNumPostShufflePartitions: Option[Int] = None)
       extends Logging {
     
       // The registered Exchange operators.
       private[this] val exchanges = ArrayBuffer[ShuffleExchangeExec]()
    --- End diff --
    
    ah you are right


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