Github user sadhen commented on the issue:
https://github.com/apache/spark/pull/22685
@HyukjinKwon Sorry. Happened to find that some code is not elegant
according to my taste. I have not got the fact that massive changes are not
good for backporting. As a result, I spent some time trying the make the code
better.
I have commented on the most important ones according to my standard.
Please review. And the rest, I will revert.
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