HyukjinKwon commented on pull request #34745:
URL: https://github.com/apache/spark/pull/34745#issuecomment-999176671


   > I should have asked this earlier; how do backports work? Is there more 
y'all need from me in that regard? I've checked and the code in this PR doesn't 
cherry pick cleanly into either `branch-3.1` or `branch-3.2`.
   
   Yeah, it's all as you said. When committers merge, they usually manually 
resolve conflicts in their local if it's minor. If there's a major conflict, 
usually they ask the author to create another PR to `branch-3.1` or 
`branch-3.2`. While we can merge them as is first and you can create 
backporting PRs, it is often easier to split a PR to multiple PRs that can be 
backported and not backported.


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