Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/19869#discussion_r154528386
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/aggregate/HashAggregateExec.scala
---
@@ -444,6 +444,7 @@ case class HashAggregateExec(
val funcName = ctx.freshName("doAggregateWithKeysOutput")
val keyTerm = ctx.freshName("keyTerm")
val bufferTerm = ctx.freshName("bufferTerm")
+ val numOutput = metricTerm(ctx, "numOutputRows")
--- End diff --
update the `numOutputRows` in the result function instead of doing it for
both fast hash map and regular hash map.
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