Github user icexelloss commented on a diff in the pull request: https://github.com/apache/spark/pull/18732#discussion_r141906843 --- Diff: python/pyspark/sql/group.py --- @@ -194,6 +194,28 @@ def pivot(self, pivot_col, values=None): jgd = self._jgd.pivot(pivot_col, values) return GroupedData(jgd, self.sql_ctx) + def apply(self, udf_obj): --- End diff -- I see. It's a totally valid concern. Yeah I think we can distinguish them by returnType. I will update the doc.
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