Github user yanboliang commented on the pull request:
https://github.com/apache/spark/pull/12930#issuecomment-220610054
It's feasible to always cast the target label column to string, but we
should refactor ```RFormula```. ```RFormula``` handles label of numeric type
and string type differently, we should unified them. But I'm not sure whether
we can finish that before 2.0.
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