Github user squito commented on the pull request:
https://github.com/apache/spark/pull/8178#issuecomment-131203131
nice find. We could also use an `IndexedSeq` (which I think is what
everyone really wants anytime they say `Seq`), but it looks like there are
other places that want an array anyway, so makes sense to just use an array
here. `IndexedSeq` would leave the door open for other optimizations -- eg.,
when the storage level is `None`, you don't actually need to create anything,
you can just return a collection which knows its `Nil` in every slot ... but
that would probably be premature optimization.
anyway, just some random thoughts. lgtm pending tests.
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