BryanCutler commented on a change in pull request #23900: [SPARK-23836][PYTHON]
Add support for StructType return in Scalar Pandas UDF
URL: https://github.com/apache/spark/pull/23900#discussion_r262331202
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File path: python/pyspark/sql/udf.py
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@@ -133,6 +133,8 @@ def returnType(self):
"UDFs: returnType must be a StructType.")
elif self.evalType == PythonEvalType.SQL_GROUPED_AGG_PANDAS_UDF:
try:
+ if isinstance(self._returnType_placeholder, StructType):
+ raise TypeError
Review comment:
Grouped Agg UDFs don't allow a `StructType` return yet, and before relied on
the call to `to_arrow_type` to raise an error. Since that no longer happens,
need to raise it here.
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