Github user WeichenXu123 commented on the issue:
https://github.com/apache/spark/pull/17819
Yes you can only move `setInputCols` into the outer class to resolve this
issue. But I prefer merge it together. I think we can unify the `transform`
method. (First we check param `inputCol` and `inputCols`, and construct a col
list and pass it to the transform code. it will simplify the code).
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