Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/18732#discussion_r142029736
--- Diff: python/pyspark/sql/group.py ---
@@ -194,6 +194,37 @@ 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):
+ """
+ Maps each group of the current [[DataFrame]] using a pandas udf
and returns the result
--- End diff --
little nit: `[[DataFrame]]` to ``:class:`DataFrame` ``
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