Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/19454
I think @srowen requested to fix it in a more performant way as well, for
example, referring https://github.com/apache/spark/pull/16276, if I understood
correctly and otherwise closing it.
I don't feel strongly about adding this but I was thinking that we might
have to go ahead given this API has been required multiple times without
explicit objection IIUC and, looks consistent with Scala's [`flatten`](
https://github.com/scala/scala/blob/05016d9035ab9b1c866bd9f12fdd0491f1ea0cbb/src/library/scala/collection/generic/GenericTraversableTemplate.scala#L169).
However, IMHO, it might be worthwhile _only if_ this PR gives a clean shot.
I'd suggest to close this if we (you and other reviewers here) have to
spend a lot of time. Workaround is quite easy anyway.
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