Github user ptkool commented on the issue: https://github.com/apache/spark/pull/18906 @HyukjinKwon As requested, here are the related Scala API changes: https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/ScalaUDF.scala#L42 https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/expressions/UserDefinedFunction.scala#L69 https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/functions.scala#L3281 https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/UDFRegistration.scala#L167
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