Github user gczsjdy commented on a diff in the pull request: https://github.com/apache/spark/pull/19763#discussion_r152008181 --- 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` needs config entry, but I thought adaptive.xxx item has been put under `spark.sql.` already, so it might be inconsitent. Now I think it's no big deal.
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