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From "Ashutosh Chauhan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-14530) Union All query returns incorrect results.
Date Thu, 01 Sep 2016 20:50:21 GMT

    [ https://issues.apache.org/jira/browse/HIVE-14530?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15456571#comment-15456571
] 

Ashutosh Chauhan commented on HIVE-14530:
-----------------------------------------

Thanks for explanation. +1

> Union All query returns incorrect results.
> ------------------------------------------
>
>                 Key: HIVE-14530
>                 URL: https://issues.apache.org/jira/browse/HIVE-14530
>             Project: Hive
>          Issue Type: Bug
>          Components: Query Planning
>    Affects Versions: 2.1.0
>         Environment: Hadoop 2.6
> Hive 2.1
>            Reporter: wenhe li
>            Assignee: Jesus Camacho Rodriguez
>         Attachments: HIVE-14530.01.patch
>
>
> create table dw_tmp.l_test1 (id bigint,val string,trans_date string) row format delimited
fields terminated by ' ' ;
> create table dw_tmp.l_test2 (id bigint,val string,trans_date string) row format delimited
fields terminated by ' ' ;  
> select * from dw_tmp.l_test1;
> 1       table_1      2016-08-11
> select * from dw_tmp.l_test2;
> 2       table_2      2016-08-11
> -- right like this
> select 
>     id,
>     'table_1' ,
>     trans_date
> from dw_tmp.l_test1
> union all
> select 
>     id,
>     val,
>     trans_date
> from dw_tmp.l_test2 ;
> 1       table_1     2016-08-11
> 2       table_2     2016-08-11
> -- incorrect
> select 
>     id,
>     999,
>     'table_1' ,
>     trans_date
> from dw_tmp.l_test1
> union all
> select 
>     id,
>     999,
>     val,
>     trans_date
> from dw_tmp.l_test2 ;
> 1       999     table_1     2016-08-11
> 2       999     table_1     2016-08-11     <-- here is wrong
> -- incorrect
> select 
>     id,
>     999,
>     666,
>     'table_1' ,
>     trans_date
> from dw_tmp.l_test1
> union all
> select 
>     id,
>     999,
>     666,
>     val,
>     trans_date
> from dw_tmp.l_test2 ;
> 1       999     666     table_1 2016-08-11
> 2       999     666     table_1 2016-08-11     <-- here is wrong
> -- right
> select 
>     id,
>     999,
>     'table_1' ,
>     trans_date,
>     '2016-11-11'
> from dw_tmp.l_test1
> union all
> select 
>     id,
>     999,
>     val,
>     trans_date,
>     trans_date
> from dw_tmp.l_test2 ;
> 1       999     table_1 2016-08-11      2016-11-11
> 2       999     table_2 2016-08-11      2016-08-11



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