Github user holdenk commented on a diff in the pull request:
https://github.com/apache/spark/pull/16536#discussion_r97908047
--- Diff: python/pyspark/sql/tests.py ---
@@ -459,6 +459,23 @@ def filename(path):
row2 = df2.select(sameText(df2['file'])).first()
self.assertTrue(row2[0].find("people.json") != -1)
+ def test_udf_defers_judf_initalization(self):
+ from pyspark.sql.functions import UserDefinedFunction
+
+ f = UserDefinedFunction(lambda x: x, StringType())
+
+ self.assertIsNone(
+ f._judf_placeholder,
+ "judf should not be initialized before the first call."
+ )
+
+ self.assertTrue(isinstance(f("foo"), Column), "UDF call should
return a Column.")
--- End diff --
there is a `assertIsInstance` function that could simplify this.
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