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https://issues.apache.org/jira/browse/SPARK-23960?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16433672#comment-16433672
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Apache Spark commented on SPARK-23960:
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User 'rednaxelafx' has created a pull request for this issue:
https://github.com/apache/spark/pull/21039
> Mark HashAggregateExec.bufVars as transient
> -------------------------------------------
>
> Key: SPARK-23960
> URL: https://issues.apache.org/jira/browse/SPARK-23960
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.3.0
> Reporter: Kris Mok
> Priority: Minor
>
> {{HashAggregateExec.bufVars}} is only used during codegen for global
> aggregation. Specifically it's only used while {{doProduceWithoutKeys()}} is
> on the stack.
> Currently, if an {{HashAggregateExec}} is ever captured for serialization,
> the {{bufVars}} would be needlessly serialized.
> This ticket proposes a minor change to mark the {{bufVars}} field as
> transient to avoid serializing it. Also, null out this field at the end of
> {{doProduceWithoutKeys()}} to reduce its lifecycle so that the
> {{Seq[ExprCode]}} being referenced can be GC'd sooner.
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