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https://issues.apache.org/jira/browse/HIVE-11387?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14682215#comment-14682215
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Pengcheng Xiong commented on HIVE-11387:
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pushed to branch-1 just now. Thanks [~hsubramaniyan].
> 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
> Fix For: 2.0.0
>
> Attachments: HIVE-11387.01.patch, HIVE-11387.02.patch,
> HIVE-11387.03.patch, HIVE-11387.04.patch, HIVE-11387.05.patch,
> HIVE-11387.06.patch, HIVE-11387.07.patch
>
>
> 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.
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