Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/21732#discussion_r228782980
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/aggregate/TypedAggregateExpression.scala
---
@@ -76,7 +76,7 @@ object TypedAggregateExpression {
None,
bufferSerializer,
bufferEncoder.resolveAndBind().deserializer,
- outputEncoder.serializer,
+ outputEncoder.objSerializer,
--- End diff --
to confirm, this is a un-related change and just clean up the code?
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