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https://issues.apache.org/jira/browse/SPARK-44571?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Peter Toth resolved SPARK-44571.
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Fix Version/s: 4.2.0
Resolution: Fixed
Issue resolved by pull request 53019
[https://github.com/apache/spark/pull/53019]
> Eliminate the Join by combine multiple Aggregates
> -------------------------------------------------
>
> Key: SPARK-44571
> URL: https://issues.apache.org/jira/browse/SPARK-44571
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 4.2.0
> Reporter: Jiaan Geng
> Assignee: Peter Toth
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.2.0
>
>
> Recently, I investigate the test case q28 which is belong to the TPC-DS
> queries.
> The query contains multiple scalar subquery with aggregation and connected
> with inner join.
> If we can merge the filters and aggregates, we can scan data source only once
> and eliminate the join so as avoid shuffle. Obviously, this change will
> improve the performance.
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