Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/2405#issuecomment-55987610
@yhuai It's hard to define the semantic of f1.f11 > f2.f22 as they are
arbitrarily nested arrays. What if the array size is not equal? What if the
nested level is not equal? Currently I just leave it there and maybe we could
give user a meaningful error message to prohibit them to do so?
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