Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/19454#discussion_r143607680
--- Diff: core/src/main/scala/org/apache/spark/rdd/RDD.scala ---
@@ -382,6 +382,13 @@ abstract class RDD[T: ClassTag](
}
/**
+ * Return a new RDD by flattening a traversable collection into a
collection itself.
+ */
--- End diff --
Please follow existing comment style like line 392.
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