Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/7627#discussion_r35380354
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/interfaces.scala
---
@@ -151,8 +147,7 @@ abstract class AggregateFunction2
/**
* A helper class for aggregate functions that can be implemented in terms
of catalyst expressions.
*/
-abstract class AlgebraicAggregate extends AggregateFunction2 with
Serializable {
- self: Product =>
--- End diff --
I think we do not need it.
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