Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/17398#discussion_r107683094
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/expressions/ReduceAggregator.scala
---
@@ -27,19 +27,17 @@ import
org.apache.spark.sql.catalyst.encoders.ExpressionEncoder
*
* This class currently assumes there is at least one input row.
*/
-private[sql] class ReduceAggregator[T: Encoder](func: (T, T) => T)
+private[sql] class ReduceAggregator[T](func: (T, T) => T)(@transient
implicit val enc: Encoder[T])
--- End diff --
we should not serialize an unresolved encoder, so I make it `transient` here
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