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From "Lefty Leverenz (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-11387) CBO: Calcite Operator To Hive Operator (Calcite Return Path) : fix reduce_deduplicate optimization
Date Wed, 12 Aug 2015 05:09:45 GMT

    [ https://issues.apache.org/jira/browse/HIVE-11387?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14692935#comment-14692935
] 

Lefty Leverenz commented on HIVE-11387:
---------------------------------------

Nudge:  this needs 1.3.0 in the Fix Version/s.

> 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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