Github user yanboliang commented on the pull request:
https://github.com/apache/spark/pull/12467#issuecomment-211451163
@BenFradet Thanks for this PR. I think we can not make ```RFormula```
supporting other numeric types for label as your proposal. If the label column
already exists, it must be type of DoubleType, otherwise it will cause the
downstream model can not recognize the label column when
```validateAndTransformSchema```.
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