Github user aarondav commented on the pull request:
https://github.com/apache/spark/pull/369#issuecomment-40033173
Ah, alas, looks like the context bound just desugars to the exact same
thing here, except we've just reordered the implicit arguments. We might be
able to get around this by clever usage of implicit conversions, but it almost
certainly wouldn't be worth it. At least having the whole parameter list
explicitly listed out makes it more obvious that you can specify the Ordering,
even if we can't remove the ugliness of also specifying a ClassTag too.
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