Github user viirya commented on the issue: https://github.com/apache/spark/pull/23100 This was discussed before when we added `OneHotEncoderEstimator` and there is a note at `OneHotEncoder`: https://github.com/apache/spark/blob/a5925c1631e25c2dcc3c2948cea31e993ce66a97/mllib/src/main/scala/org/apache/spark/ml/feature/OneHotEncoder.scala#L44-L45
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