Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/7987#issuecomment-128471053
@ericl Shall we split this PR into two?
1. Add `Interaction` as a transformer (SPARK-9698).
2. Support feature interaction in RFormula.
After 1) is merged, people can start working on the Python API, without
being blocked by 2).
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