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https://issues.apache.org/jira/browse/HIVE-11387?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14652101#comment-14652101
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Pengcheng Xiong commented on HIVE-11387:
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[~jcamachorodriguez], sure, please do so. Thanks.
> CBO: Calcite Operator To Hive Operator (Calcite Return Path) : fix
> reduce_deduplicate optimization
> --------------------------------------------------------------------------------------------------
>
> Key: HIVE-11387
> URL: https://issues.apache.org/jira/browse/HIVE-11387
> Project: Hive
> Issue Type: Sub-task
> Components: CBO
> Reporter: Pengcheng Xiong
> Assignee: Pengcheng Xiong
> Attachments: HIVE-11387.01.patch, HIVE-11387.02.patch,
> HIVE-11387.03.patch, HIVE-11387.04.patch
>
>
> {noformat}
> The main problem is that, due to return path, now we may have
> (RS1-GBY2)-(RS3-GBY4) when map.aggr=false, i.e., no map aggr. However, in the
> non-return path, it will be treated as (RS1)-(GBY2-RS3-GBY4). The main
> problem is that it does not take into account of the setting.
> {noformat}
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