Github user yanboliang commented on the issue:
https://github.com/apache/spark/pull/16169
@felixcheung This is a good question. It's reasonable to call
```.setProbabilityCol(probabilityCol)``` on a model or a pipeline model, and
this should be handled at model transformation step(after fitting on the
pipeline or a single estimator). Users can set multiple times to different
values to a generated model, rather than re-training model several times.
Thanks.
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