cloud-fan commented on code in PR #39747:
URL: https://github.com/apache/spark/pull/39747#discussion_r1091350090


##########
sql/core/src/test/scala/org/apache/spark/sql/ColumnExpressionSuite.scala:
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@@ -3081,4 +3081,19 @@ class ColumnExpressionSuite extends QueryTest with 
SharedSparkSession {
     checkAnswer(df.select($"dd" / ($"num" + 3)),
       Seq((Duration.ofDays(2))).toDF)
   }
+
+  test("luhn check") {

Review Comment:
   I think the golden file tests fully cover it. If we add a scala API for luhn 
check, we need this test.



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