Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/22305#discussion_r232485374
--- Diff: python/pyspark/sql/tests.py ---
@@ -89,6 +89,7 @@
from pyspark.sql.types import _merge_type
from pyspark.tests import QuietTest, ReusedPySparkTestCase,
PySparkTestCase, SparkSubmitTests
from pyspark.sql.functions import UserDefinedFunction, sha2, lit
+import pyspark.sql.functions as F
--- End diff --
nit: looks it's used nowhere.
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