[jira] [Created] (SPARK-23960) Mark HashAggregateExec.bufVars as transient

["Kris Mok (JIRA)" <ji...@apache.org>]

Kris Mok created SPARK-23960:
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             Summary: Mark HashAggregateExec.bufVars as transient
                 Key: SPARK-23960
                 URL: https://issues.apache.org/jira/browse/SPARK-23960
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 2.3.0
            Reporter: Kris Mok


{{HashAggregateExec.bufVars}} is only used during codegen for global aggregation. Specifically it's only used while {{doProduceWithoutKeys()}} is on the stack.
Currently, if an {{HashAggregateExec}} is ever captured for serialization, the {{bufVars}} would be needlessly serialized.

This ticket proposes a minor change to mark the {{bufVars}} field as transient to avoid serializing it. Also, null out this field at the end of {{doProduceWithoutKeys()}} to reduce its lifecycle so that the {{Seq[ExprCode]}} being referenced can be GC'd sooner.



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