Github user BryanCutler commented on a diff in the pull request:

    https://github.com/apache/spark/pull/18732#discussion_r142244781
  
    --- 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
    +        as a :class:`DataFrame`.
    +
    +        """
    +        from pyspark.sql.functions import pandas_udf
    +
    +        if not udf_obj._vectorized:
    +            raise ValueError("Must pass a pandas_udf")
    +        if not isinstance(udf_obj.returnType, StructType):
    +            raise ValueError("Must pass a StructType as return type in 
pandas_udf")
    --- End diff --
    
    Similar to above, maybe: "The pandas_udf in apply() must return a 
StructType"


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