Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/19872#discussion_r161503314
--- Diff: python/pyspark/sql/udf.py ---
@@ -111,6 +111,10 @@ def returnType(self):
and not isinstance(self._returnType_placeholder,
StructType):
raise ValueError("Invalid returnType: returnType must be a
StructType for "
"pandas_udf with function type GROUP_MAP")
+ elif self.evalType == PythonEvalType.SQL_PANDAS_GROUP_AGG_UDF \
+ and isinstance(self._returnType_placeholder, (StructType,
ArrayType)):
--- End diff --
Hm .. i think we don't support `MapType` too?
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