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Posted to issues@hive.apache.org by "Pengcheng Xiong (JIRA)" <ji...@apache.org> on 2015/09/10 02:16:45 UTC

[jira] [Updated] (HIVE-11775) Implement limit push down through union all in CBO

     [ https://issues.apache.org/jira/browse/HIVE-11775?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Pengcheng Xiong updated HIVE-11775:
-----------------------------------
    Attachment: HIVE-11775.01.patch

initial patch, need to add more test cases.

> 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
>            Reporter: Pengcheng Xiong
>            Assignee: Pengcheng Xiong
>         Attachments: HIVE-11775.01.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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