viirya commented on a change in pull request #27165: [SPARK-28264][PYTHON][SQL] 
Support type hints in pandas UDF and rename/move inconsistent pandas UDF types
URL: https://github.com/apache/spark/pull/27165#discussion_r368843427
 
 

 ##########
 File path: python/pyspark/sql/tests/test_pandas_udf_typehints.py
 ##########
 @@ -0,0 +1,273 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+import sys
+import unittest
+import inspect
+
+from pyspark.sql.functions import mean, lit
+from pyspark.testing.sqlutils import ReusedSQLTestCase, \
+    have_pandas, have_pyarrow, pandas_requirement_message, \
+    pyarrow_requirement_message
+from pyspark.sql.pandas.typehints import infer_eval_type
+from pyspark.sql.pandas.functions import pandas_udf, PandasUDFType
+
+if have_pandas:
+    import pandas as pd
+    from pandas.util.testing import assert_frame_equal
+
+python_requirement_message = "pandas UDF with type hints are supported with 
Python 3.6+."
+
+
+@unittest.skipIf(
+    not have_pandas or not have_pyarrow or sys.version_info[:2] < (3, 6),
+    pandas_requirement_message or pyarrow_requirement_message or 
python_requirement_message)
+class PandasUDFTypeHintsTests(ReusedSQLTestCase):
+    # Note that, we should not remove `exec` once we drop Python 2 in this 
class.
 
 Review comment:
   Not sure about this. To confirm, does it mean we should not remove `exec` 
even after we drop Python 2 support?

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