Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/20211#discussion_r160584966
--- Diff: python/pyspark/sql/group.py ---
@@ -233,6 +233,27 @@ def apply(self, udf):
| 2| 1.1094003924504583|
+---+-------------------+
+ Notes on grouping column:
--- End diff --
+1 for ^
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