Github user gatorsmile commented on a diff in the pull request: https://github.com/apache/spark/pull/17911#discussion_r115540428 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/expressions/UserDefinedFunction.scala --- @@ -47,12 +47,37 @@ case class UserDefinedFunction protected[sql] ( dataType: DataType, inputTypes: Option[Seq[DataType]]) { + private var _nullable: Boolean = true + + def nullable: Boolean = _nullable + /** * Returns an expression that invokes the UDF, using the given arguments. * * @since 1.3.0 */ def apply(exprs: Column*): Column = { - Column(ScalaUDF(f, dataType, exprs.map(_.expr), inputTypes.getOrElse(Nil))) + Column(ScalaUDF( + f, + dataType, + exprs.map(_.expr), + inputTypes.getOrElse(Nil), + nullable = _nullable)) + } + + private def copyAll(): UserDefinedFunction = { + val udf = copy() + udf._nullable = _nullable + udf + } + + protected[sql] def withNullability(nullable: Boolean): UserDefinedFunction = { --- End diff -- This can be a public function? Also add a function description?
--- If your project is set up for it, you can reply to this email and have your reply appear on GitHub as well. If your project does not have this feature enabled and wishes so, or if the feature is enabled but not working, please contact infrastructure at infrastruct...@apache.org or file a JIRA ticket with INFRA. --- --------------------------------------------------------------------- To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org