HyukjinKwon commented on a change in pull request #35205:
URL: https://github.com/apache/spark/pull/35205#discussion_r784490412



##########
File path: dev/merge_spark_pr.py
##########
@@ -135,11 +135,12 @@ def merge_pr(pr_num, target_ref, title, body, 
pr_repo_desc):
         continue_maybe(msg)
         had_conflicts = True
 
+    # First commit author should be considered as the primary author when the 
rank is the same
     commit_authors = run_cmd(
-        ["git", "log", "HEAD..%s" % pr_branch_name, "--pretty=format:%an 
<%ae>"]
+        ["git", "log", "HEAD..%s" % pr_branch_name, "--pretty=format:%an 
<%ae>", "--reverse"]
     ).split("\n")
     distinct_authors = sorted(
-        set(commit_authors), key=lambda x: commit_authors.count(x), 
reverse=True
+        list(dict.fromkeys(commit_authors)), key=lambda x: 
commit_authors.count(x), reverse=True

Review comment:
       Actually the sort is with `key=lambda x: commit_authors.count(x)`. For 
the same elements, I think it keeps its natural order.  IIRC `sorted` in Python 
is Timesort that is a stable sort that keeps the same order of same keys




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