Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/20036#discussion_r158776770
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/aggregate/HashAggregateExec.scala
---
@@ -587,20 +587,24 @@ case class HashAggregateExec(
fastHashMapClassName, groupingKeySchema, bufferSchema).generate()
ctx.addInnerClass(generatedMap)
+ // inline mutable state since not many aggregation operations in a
task
--- End diff --
nit: `Inline`
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