Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/21588
Yes, that was what I was thinking at worst case. For clarification,
@wangyum made a try and all tests were passed at least -
https://github.com/apache/spark/pull/20659. Given this try, I think it looks
pretty much feasible to upgrade without breaking compatibility.
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