Github user jaceklaskowski commented on a diff in the pull request: https://github.com/apache/spark/pull/17712#discussion_r112692504 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/expressions/UserDefinedFunction.scala --- @@ -47,20 +47,31 @@ case class UserDefinedFunction protected[sql] ( dataType: DataType, inputTypes: Option[Seq[DataType]]) { - // Optionally used for printing UDF names in EXPLAIN - private var nameOption: Option[String] = None + protected def name: Option[String] = None - def withName(name: String): this.type = { - this.nameOption = Option(name) - this - } + // Optionally used for printing UDF names in EXPLAIN + def withName(name: String): this.type = + UserDefinedFunctionWithName(Option(name), f, dataType, inputTypes) /** * 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), nameOption)) + Column(ScalaUDF(f, dataType, exprs.map(_.expr), inputTypes.getOrElse(Nil), name)) } } + +/** + * A user-defined function with a function name. + * + * @since 2.3.0 + */ +@InterfaceStability.Stable +case class UserDefinedFunctionWithName protected[sql] ( + override val name: Option[String], --- End diff -- Can a `UserDefinedFunctionWithName` have **no** name? When?
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