Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/21732#discussion_r228785236
--- 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 --
This is required. Without this, the output schema of aggregator using
Option[Product] as output encoder is not correct.
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