cloud-fan commented on a change in pull request #32786:
URL: https://github.com/apache/spark/pull/32786#discussion_r646768762
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File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/CollectMetricsExec.scala
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@@ -69,7 +69,7 @@ case class CollectMetricsExec(
// - Performance issues due to excessive serialization.
Review comment:
> So, I wonder a simple way is to have a general purpose task local
storage in TaskContext and use it for task local accumulator.
It needs a bit API design for the task local storage.
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