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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