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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