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From "Brock Noland (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-7767) hive.optimize.union.remove does not work properly [Spark Branch]
Date Wed, 20 Aug 2014 22:05:26 GMT

    [ https://issues.apache.org/jira/browse/HIVE-7767?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14104678#comment-14104678
] 

Brock Noland commented on HIVE-7767:
------------------------------------

Hi,

Thank you! Let's not test union_remove_22 for now. We can add it later if needed.

Yes, please file a separate JIRA for union_remove_10 and remove it from this patch.

Thank you!!

> hive.optimize.union.remove does not work properly [Spark Branch]
> ----------------------------------------------------------------
>
>                 Key: HIVE-7767
>                 URL: https://issues.apache.org/jira/browse/HIVE-7767
>             Project: Hive
>          Issue Type: Sub-task
>            Reporter: Na Yang
>            Assignee: Na Yang
>         Attachments: HIVE-7767.1-spark.patch, HIVE-7767.2-spark.patch, HIVE-7767.2-spark.patch
>
>
> Turing on the hive.optimize.union.remove property generates wrong union all result. 
> For Example:
> {noformat}
> create table inputTbl1(key string, val string) stored as textfile;
> load data local inpath '../../data/files/T1.txt' into table inputTbl1;
> SELECT *
> FROM (
>   SELECT key, count(1) as values from inputTbl1 group by key
>   UNION ALL
>   SELECT key, count(1) as values from inputTbl1 group by key
> ) a;  
> {noformat}
> when the hive.optimize.union.remove is turned on, the query result is like: 
> {noformat}
> 1	1
> 2	1
> 3	1
> 7	1
> 8	2
> {noformat}
> when the hive.optimize.union.remove is turned off, the query result is like: 
> {noformat}
> 7	1
> 2	1
> 8	2
> 3	1
> 1	1
> 7	1
> 2	1
> 8	2
> 3	1
> 1	1
> {noformat}
> The expected query result is:
> {noformat}
> 7	1
> 2	1
> 8	2
> 3	1
> 1	1
> 7	1
> 2	1
> 8	2
> 3	1
> 1	1
> {noformat}



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