Github user shivaram commented on the pull request:
https://github.com/apache/spark/pull/9785#issuecomment-157951037
Its less about the change to the SparkR code - I worry that the generic we
are exporting is not really that "generic" and its very specific instead. In
the case of things like `subset` and `lag` we are removing parameters from our
generic and hence seems to be a good idea.
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