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Subject [GitHub] [spark] cloud-fan commented on a change in pull request #27466: [SPARK-30722][PYTHON][DOCS] Update documentation for Pandas UDF with Python type hints
Date Mon, 10 Feb 2020 12:13:06 GMT
cloud-fan commented on a change in pull request #27466: [SPARK-30722][PYTHON][DOCS] Update
documentation for Pandas UDF with Python type hints
URL: https://github.com/apache/spark/pull/27466#discussion_r377026073
 
 

 ##########
 File path: python/pyspark/sql/pandas/functions.py
 ##########
 @@ -348,10 +273,21 @@ def pandas_udf(f=None, returnType=None, functionType=None):
     .. note:: The user-defined functions do not take keyword arguments on the calling side.
 
     .. note:: The data type of returned `pandas.Series` from the user-defined functions should
be
-        matched with defined returnType (see :meth:`types.to_arrow_type` and
+        matched with defined `returnType` (see :meth:`types.to_arrow_type` and
         :meth:`types.from_arrow_type`). When there is mismatch between them, Spark might
do
         conversion on returned data. The conversion is not guaranteed to be correct and results
         should be checked for accuracy by users.
+
+    .. note:: Currently,
+        :class:`pyspark.sql.types.MapType`,
+        :class:`pyspark.sql.types.ArrayType` of :class:`pyspark.sql.types.TimestampType`
and
+        nested :class:`pyspark.sql.types.StructType`
+        are currently not supported as output types.
 
 Review comment:
   what about input types?

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