Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/9591#discussion_r44732740
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/expressions/Aggregator.scala ---
@@ -47,7 +47,7 @@ import org.apache.spark.sql.{Dataset, DataFrame,
TypedColumn}
* @tparam B The type of the intermediate value of the reduction.
* @tparam C The type of the final result.
*/
-abstract class Aggregator[-A, B, C] {
+abstract class Aggregator[-A, B, C] extends Serializable {
--- End diff --
good idea
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