[jira] [Commented] (SPARK-43232) Improve ObjectHashAggregateExec performance for high cardinality

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-43232?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17715417#comment-17715417 ] 

ASF GitHub Bot commented on SPARK-43232:
----------------------------------------

User 'ulysses-you' has created a pull request for this issue:
https://github.com/apache/spark/pull/40915

> 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 reused for all rest rows
>  



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