Github user zhengruifeng commented on the issue:

    https://github.com/apache/spark/pull/20164
  
    @WeichenXu123 Yes, my concern is that it is confusing if the transform 
failure is caused by column conflict by a ‘invisible’ column.
    
    @srowen Agree that it is not perfect if we alter the output's raw 
prediction column. I think it maybe better to revert `rawPrediction` of base 
models after transform, and I will have a try.


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