Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/23248#discussion_r239430084
--- Diff: python/pyspark/sql/tests/test_udf.py ---
@@ -23,7 +23,7 @@
from pyspark import SparkContext
from pyspark.sql import SparkSession, Column, Row
-from pyspark.sql.functions import UserDefinedFunction
+from pyspark.sql.functions import UserDefinedFunction, udf
--- End diff --
add the import here, as a lof of tests use it
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