Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/19454#discussion_r143612478
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala ---
@@ -2543,6 +2543,14 @@ class Dataset[T] private[sql](
mapPartitions(_.flatMap(func))
/**
+ * Returns a new Dataset by by flattening a traversable collection into
a collection itself.
+ *
--- End diff --
(and `by by` -> by` I guess)
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