Github user kiszk commented on a diff in the pull request:
https://github.com/apache/spark/pull/21039#discussion_r180872742
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/aggregate/HashAggregateExec.scala
---
@@ -236,6 +236,8 @@ case class HashAggregateExec(
| }
""".stripMargin)
+ bufVars = null // explicitly null this field out to allow the
referent to be GC'd sooner
--- End diff --
Ah, got it. Thank you for the clarification.
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