Github user WeichenXu123 commented on the issue:
https://github.com/apache/spark/pull/17819
@MLnick Yea, you're right, only move `setXXX` to concrete class also work
fine. The root cause is the `setXXX` return type. But I think the multi /
single logic can be merged, because single input column is a special case of
multiple input column. What do you think of it ?
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