Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/16766#discussion_r122619526
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala ---
@@ -2603,12 +2603,27 @@ class Dataset[T] private[sql](
* current upstream partitions will be executed in parallel (per whatever
* the current partitioning is).
*
+ * A [[PartitionCoalescer]] can also be supplied allowing the behavior
of the partitioning to be
+ * customized similar to [[RDD.coalesce]].
--- End diff --
I think it should be `[[org.apache.spark.rdd.RDD##coalesce]]`.
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