Github user jkbradley commented on the pull request:
https://github.com/apache/spark/pull/7266#issuecomment-126966262
I was taking another look at it, and I like the setup. But one thing I had
not thought of was a third option: creating a new label/index which all unseen
values are mapped to. That would let users avoid filtering out rows, and
instead replace the bad/unseen values with a default value. Rather than
putting that in this PR, could you modify the Param to be a String, so that we
can specify other options in the future?
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