Github user yhuai commented on a diff in the pull request: https://github.com/apache/spark/pull/9568#discussion_r44487589 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/expressions/udaf.scala --- @@ -129,6 +129,13 @@ abstract class UserDefinedAggregateFunction extends Serializable { isDistinct = true) Column(aggregateExpression) } + + /** + * The name of the UDAF. This is currently the simple name of class. This can create an + * [[java.lang.InternalError]] if the UDAF class was created in the REPL; override this method + * in these cases. + */ + def name: String = getClass.getSimpleName --- End diff -- I am wondering if we can catch the error and re-throw it with a more informative error message? In our error message, we can let the user know he/she needs to override `def name` to workaround that Scala issue.
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