Github user xuanyuanking commented on a diff in the pull request:
https://github.com/apache/spark/pull/22326#discussion_r214805785
--- Diff: python/pyspark/sql/tests.py ---
@@ -545,6 +545,15 @@ def test_udf_in_filter_on_top_of_join(self):
right = self.spark.createDataFrame([Row(b=1)])
f = udf(lambda a, b: a == b, BooleanType())
df = left.crossJoin(right).filter(f("a", "b"))
+
+ def test_udf_in_join_condition(self):
--- End diff --
Sorry for the mess here, I'm changing.
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