HyukjinKwon commented on a change in pull request #25130:
[SPARK-28359][test-maven][SQL][PYTHON][TESTS] Make integrated UDF tests robust
by making UDFs (virtually) no-op
URL: https://github.com/apache/spark/pull/25130#discussion_r303277726
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File path: sql/core/src/test/scala/org/apache/spark/sql/JoinSuite.scala
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@@ -980,7 +980,7 @@ class JoinSuite extends QueryTest with SharedSQLContext {
val left = Seq((1, 2), (2, 3)).toDF("a", "b")
val right = Seq((1, 2), (3, 4)).toDF("c", "d")
- val df = left.join(right, pythonTestUDF($"a") === pythonTestUDF($"c"))
Review comment:
Yea .. I would like to eventually support that case in the near future ...
Problem is that we need to get the type of input column to set it back when it
casts back to the input type but `$"col"` gives unresolved attribute. So
apparently cannot peek the input type.
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