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From "Pengcheng Xiong (JIRA)" <>
Subject [jira] [Commented] (HIVE-9039) Support Union Distinct
Date Wed, 11 Feb 2015 18:12:12 GMT


Pengcheng Xiong commented on HIVE-9039:

[~leftylev], thanks a lot for your comments. I have addressed them accordingly in wiki. Please
let me know if there is any more. Thanks again.

> Support Union Distinct
> ----------------------
>                 Key: HIVE-9039
>                 URL:
>             Project: Hive
>          Issue Type: New Feature
>          Components: Query Planning
>            Reporter: Pengcheng Xiong
>            Assignee: Pengcheng Xiong
>              Labels: TODOC1.2
>             Fix For: 1.2.0
>         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,
HIVE-9039.10.patch, HIVE-9039.11.patch, HIVE-9039.12.patch, HIVE-9039.13.patch, HIVE-9039.14.patch,
HIVE-9039.15.patch, HIVE-9039.16.patch, HIVE-9039.17.patch, HIVE-9039.18.patch, HIVE-9039.19.patch,
HIVE-9039.20.patch, HIVE-9039.21.patch, HIVE-9039.22.patch, HIVE-9039.23.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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