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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