Github user gatorsmile commented on a diff in the pull request: https://github.com/apache/spark/pull/22319#discussion_r214784141 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/expressions/UserDefinedFunction.scala --- @@ -41,12 +41,16 @@ import org.apache.spark.sql.types.DataType case class UserDefinedFunction protected[sql] ( f: AnyRef, dataType: DataType, - inputTypes: Option[Seq[ScalaReflection.Schema]]) { + inputTypes: Option[Seq[DataType]]) { --- End diff -- +1. This is why we added _nameOption, _nullable and _deterministic in 2.3 release. Please also remove the changes of MimaExcludes.scala made in https://github.com/apache/spark/pull/22259
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