Github user aarondav commented on the pull request:
https://github.com/apache/incubator-spark/pull/604#discussion_r9780111
These changes may actually be problematic, as they are part of a publicly
accessible API. Even removing the specialization of V is not really
backwards-compatible for explicit callers from Java (though that's unlikely).
Definitely willing revert either/both the ordering and the extraneous ClassTag.
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