c21 commented on a change in pull request #31340:
URL: https://github.com/apache/spark/pull/31340#discussion_r564282252
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/aggregate/ObjectAggregationIterator.scala
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@@ -57,6 +59,10 @@ class ObjectAggregationIterator(
private[this] var aggBufferIterator: Iterator[AggregationBufferEntry] = _
+ // Remember spill data size of this task before execute this operator so
that we can
+ // figure out how many bytes we spilled for this operator.
+ private val spillSizeBefore =
TaskContext.get().taskMetrics().memoryBytesSpilled
Review comment:
This is same as [hash
aggregate](https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/execution/aggregate/TungstenAggregationIterator.scala#L113).
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