cloud-fan commented on a change in pull request #34474:
URL: https://github.com/apache/spark/pull/34474#discussion_r742695249
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/interfaces.scala
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@@ -621,6 +621,17 @@ abstract class TypedImperativeAggregate[T] extends
ImperativeAggregate {
buffer(mutableAggBufferOffset) = serialize(getBufferObject(buffer))
}
+ /**
+ * In-place replaces SparkSQL internally supported underlying storage format
(BinaryType),
+ * with the aggregation buffer object stored at buffer's index
`mutableAggBufferOffset`.
+ *
+ * This is only called when AggregatingAccumulator running on driver, after
the framework
+ * shuffle in aggregate buffers.
Review comment:
This is nothing to do with shuffle
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