Github user BryanCutler commented on a diff in the pull request:
https://github.com/apache/spark/pull/20892#discussion_r176829827
--- Diff: python/pyspark/sql/functions.py ---
@@ -28,10 +27,10 @@
from pyspark import since, SparkContext
from pyspark.rdd import ignore_unicode_prefix, PythonEvalType
-from pyspark.serializers import PickleSerializer, AutoBatchedSerializer
from pyspark.sql.column import Column, _to_java_column, _to_seq
from pyspark.sql.dataframe import DataFrame
from pyspark.sql.types import StringType, DataType
+# Keep UserDefinedFunction import for backwards compatible import; moved
in SPARK-22409
from pyspark.sql.udf import UserDefinedFunction, _create_udf
--- End diff --
Not sure if there is a better way to do this other than importing
`UserDefinedFunction` here, but hopefully the note will show the intent.
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