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From "Pengcheng Xiong (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-9039) Support Union Distinct
Date Thu, 08 Jan 2015 00:43:35 GMT

     [ https://issues.apache.org/jira/browse/HIVE-9039?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Pengcheng Xiong updated HIVE-9039:
----------------------------------
    Attachment: HIVE-9039.10.patch

After discussing with [~jpullokkaran], we are going to separate the union distinct with union
order by/limit bug. This patch is for union distinct implementation only and should be committed
after select distinct *

> Support Union Distinct
> ----------------------
>
>                 Key: HIVE-9039
>                 URL: https://issues.apache.org/jira/browse/HIVE-9039
>             Project: Hive
>          Issue Type: New Feature
>            Reporter: Pengcheng Xiong
>            Assignee: Pengcheng Xiong
>         Attachments: HIVE-9039.01.patch, HIVE-9039.02.patch, HIVE-9039.03.patch, HIVE-9039.04.patch,
HIVE-9039.05.patch, HIVE-9039.06.patch, HIVE-9039.07.patch, HIVE-9039.08.patch, HIVE-9039.09.patch
>
>
> Current version (Hive 0.14) does not support union (or union distinct). It only supports
union all. In this patch, we try to add this new feature by rewriting union distinct to union
all followed by group by.



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