Github user mengxr commented on the issue: https://github.com/apache/spark/pull/22492 @cloud-fan said above the next version is very likely to be 2.5.0 instead of 3.0. Well the next version number is not fully discussed yet. For that reason, I think we should revert the changes in master as well. After that we should check if the feature itself can be added without introducing breaking changes.
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