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https://issues.apache.org/jira/browse/HIVE-14251?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15504346#comment-15504346
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Sergey Shelukhin commented on HIVE-14251:
-----------------------------------------

Does this affect branch-1? Having incorrect results should warrant a fix in all 
the branches (2.1, 2.0, 1.3?)

> 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
>             Fix For: 2.2.0
>
>         Attachments: HIVE-14251.1.patch, HIVE-14251.2.patch, 
> HIVE-14251.3.patch, HIVE-14251.4.patch, HIVE-14251.5.patch, HIVE-14251.6.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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