Github user jkbradley commented on the issue: https://github.com/apache/spark/pull/17090 @hhbyyh This is different from https://github.com/apache/spark/pull/12574 since it sidesteps the ongoing design discussions about input and output schema. Eventually, I'd like us to proceed with https://github.com/apache/spark/pull/12574 but only after we've figured out the right workflow for using these methods in a Pipeline with tuning.
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