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https://issues.apache.org/jira/browse/SPARK-43232?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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XiDuo You updated SPARK-43232:
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Summary: Improve ObjectHashAggregateExec performance for high cardinality
(was: Improve ObjectHashAggregateExec performance with high cardinality)
> Improve ObjectHashAggregateExec performance for high cardinality
> ----------------------------------------------------------------
>
> Key: SPARK-43232
> URL: https://issues.apache.org/jira/browse/SPARK-43232
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.5.0
> Reporter: XiDuo You
> Priority: Major
>
> The `ObjectHashAggregateExec` has three preformance issues:
> - heavy overhead of scala sugar in `createNewAggregationBuffer`
> - unnecessary grouping key comparation after fallback to sort based
> aggregator
> - the aggregation buffer in sort based aggregator is not actually reused
>
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