Github user hhbyyh commented on the issue: https://github.com/apache/spark/pull/17767 Preparing a PR like this takes a lot of efforts. Please try to follow the guidelines in http://spark.apache.org/contributing.html. (create a jira and rename the title). Like you said, I doubt if anyone would be able to review and confidently merge a PR of this scope. Could you please share some reasons for the refactoring or pain points of the current implementation? Then maybe we can find a way to break it down to some smaller changes. Thanks.
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