dongjoon-hyun commented on PR #58071:
URL: https://github.com/apache/spark/pull/58071#issuecomment-5329803190

   Yes, @gaogaotiantian . This is technically a Git commit log policy, instead 
of GitHub Pull Request policy. Apache Spark community has been maintaining ASF 
Git repo over 13 years.
   
   As you know, every branch is different. The commit is not identical in terms 
of line number or content.
   
   So, for example,
   1. You made multiple commits for SPARK-58834 in `master` branch.
   2. Then, you are trying to backport it to `branch-3.5` as a single unified 
commit to `branch-3.5`.
   3. After merging this PR, `branch-3.5` will has the initial SPARK-58834.
   4. If you found another followup content, you will start to backport it from 
master to branch-3.5 again. In that case, the second commit of `branch-3.5` 
will have `[FOLLOWUP]`.
   
   The bottom line is that this is a commit log policy for `git log` command.


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