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From "Pengcheng Xiong (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-11775) Implement limit push down through union all in CBO
Date Sat, 19 Dec 2015 22:39:46 GMT

    [ https://issues.apache.org/jira/browse/HIVE-11775?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15065555#comment-15065555
] 

Pengcheng Xiong commented on HIVE-11775:
----------------------------------------

[~leftylev], thanks for your reminder. I have modified accordingly, could you take a look
and remove the label? Thanks.

> Implement limit push down through union all in CBO
> --------------------------------------------------
>
>                 Key: HIVE-11775
>                 URL: https://issues.apache.org/jira/browse/HIVE-11775
>             Project: Hive
>          Issue Type: New Feature
>    Affects Versions: 1.2.1
>            Reporter: Pengcheng Xiong
>            Assignee: Pengcheng Xiong
>              Labels: TODOC2.0
>             Fix For: 2.0.0, 2.1.0
>
>         Attachments: HIVE-11775.01.patch, HIVE-11775.02.patch, HIVE-11775.03.patch, HIVE-11775.04.patch,
HIVE-11775.05.patch, HIVE-11775.06.patch, HIVE-11775.07.patch, HIVE-11775.08.patch, HIVE-11775.09.patch,
HIVE-11775.10.patch, HIVE-11775.11.patch, HIVE-11775.12.patch, HIVE-11775.13.patch
>
>
> Enlightened by HIVE-11684 (Kudos to [~jcamachorodriguez]), we can actually push limit
down through union all, which reduces the intermediate number of rows in union branches. 



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