Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/8178#issuecomment-131425697
One potential gotcha of using arrays: we might run into problems with array
equality checks returning `false` because they're based on the array identity
rather than contents. Given this, maybe it would be safer to use `IndexedSeq`;
the alternative would be to carefully search the existing code to figure out
whether this change has accidentally broken any comparisons.
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