Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/16276#discussion_r92450063
--- Diff: core/src/main/scala/org/apache/spark/rdd/RDD.scala ---
@@ -381,6 +381,14 @@ abstract class RDD[T: ClassTag](
}
/**
+ * Return a new RDD by flattening all elements from RDD with
traversable elements
+ */
+ def flatten[U: ClassTag](implicit asTraversable: T =>
TraversableOnce[U]): RDD[U] = withScope {
--- End diff --
I think that if this is done, it's worth implementing more efficiently and
not just by calling flatMap.
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