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Date: Fri, 5 Aug 2016 20:27:20 +0000 (UTC)
From: "Mohit Sabharwal (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (HIVE-14251) Union All of different types
 resolves to incorrect data
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archived-at: Fri, 05 Aug 2016 20:27:22 -0000


    [ https://issues.apache.org/jira/browse/HIVE-14251?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15410019#comment-15410019 ] 

Mohit Sabharwal commented on HIVE-14251:
----------------------------------------

LGTM, +1

Should this behavior change be documented in https://cwiki.apache.org/confluence/display/Hive/LanguageManual+Union ?  

> Union All of different types resolves to incorrect data
> -------------------------------------------------------
>
>                 Key: HIVE-14251
>                 URL: https://issues.apache.org/jira/browse/HIVE-14251
>             Project: Hive
>          Issue Type: Bug
>          Components: Query Planning
>    Affects Versions: 2.0.0
>            Reporter: Aihua Xu
>            Assignee: Aihua Xu
>         Attachments: HIVE-14251.1.patch, HIVE-14251.2.patch, HIVE-14251.3.patch, HIVE-14251.4.patch
>
>
> create table src(c1 date, c2 int, c3 double);
> insert into src values ('2016-01-01',5,1.25);
> select * from 
> (select c1 from src union all
> select c2 from src union all
> select c3 from src) t;
> It will return NULL for the c1 values. Seems the common data type is resolved to the last c3 which is double.


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