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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