Github user icexelloss commented on a diff in the pull request:
https://github.com/apache/spark/pull/20211#discussion_r161659200
--- Diff: python/pyspark/sql/group.py ---
@@ -233,6 +233,27 @@ def apply(self, udf):
| 2| 1.1094003924504583|
+---+-------------------+
+ Notes on grouping column:
--- End diff --
Sorry for the late reply. I agree with @HyukjinKwon, I think we can do
support both `foo(pdf)` and `foo(key, pdf)` through inspection.
I will try to put up a PR soon.
As to how to represent key, I think a tuple might be enough but I think a
row also works. What do you guys think?
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