Github user icexelloss commented on a diff in the pull request: https://github.com/apache/spark/pull/20211#discussion_r160524679 --- Diff: python/pyspark/sql/group.py --- @@ -233,6 +233,27 @@ def apply(self, udf): | 2| 1.1094003924504583| +---+-------------------+ + Notes on grouping column: --- End diff -- This explains the general idea. I plan to improve the doc if people think this change is good.
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