Github user dongjoon-hyun commented on the issue: https://github.com/apache/spark/pull/22492 Thank you! Although `master` becomes [3.0.0](https://github.com/apache/spark/pull/22606) already and seems to start to target `Mar 2019`, I agree with you on reverting for rechecking, @mengxr . Spark 3.0.0 has better have the minimal number of incompatible APIs.
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