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

    https://github.com/apache/spark/pull/19763#discussion_r151962448
  
    --- Diff: 
core/src/main/scala/org/apache/spark/internal/config/package.scala ---
    @@ -485,4 +485,13 @@ package object config {
             "array in the sorter.")
           .intConf
           .createWithDefault(Integer.MAX_VALUE)
    +
    +  private[spark] val 
SHUFFLE_MAP_OUTPUT_STATISTICS_PARALLEL_AGGREGATION_THRESHOLD =
    --- End diff --
    
    `spark.adaptive.map.statistics.cores` should also be a config entry like 
this


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