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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