Github user cloud-fan commented on the issue: https://github.com/apache/spark/pull/22464 @viirya Thanks for doing it! To ease the review, can you revert these 4 commits sequentially with `git revert commit-hash`? Thanks! https://github.com/apache/spark/pull/22344 https://github.com/apache/spark/pull/22330 https://github.com/apache/spark/pull/22239 https://github.com/apache/spark/pull/16677
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