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https://issues.apache.org/jira/browse/SPARK-32750?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17188071#comment-17188071
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Takeshi Yamamuro commented on SPARK-32750:
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Yea, I don't remember the impl. details in the PR, but you might be able to
refer to parts of them ;)
> Add code-gen for SortAggregateExec
> ----------------------------------
>
> Key: SPARK-32750
> URL: https://issues.apache.org/jira/browse/SPARK-32750
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.1.0
> Reporter: Cheng Su
> Priority: Minor
>
> We have codegen for hash aggregate (`HashAggregateExec`) for a long time, but
> missing codegen for sort aggregate (`SortAggregate`). Sort aggregate is still
> useful in terms of performance if (1). the data after aggregate still too big
> to fit in memory (both hash aggregate and object hash aggregate needs to
> spill), (2).user can disable hash aggregate and object hash aggregate by
> config to prefer sort aggregate if the aggregate is after e.g. sort merge
> join and do not need sort at all.
> Create this Jira to add codegen support for sort aggregate.
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