[jira] [Assigned] (HIVE-7810) Insert overwrite table query has strange behavior when set hive.optimize.union.remove=true [Spark Branch]

["Na Yang (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-7810?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Na Yang reassigned HIVE-7810:
-----------------------------

    Assignee: Na Yang

> Insert overwrite table query has strange behavior when set hive.optimize.union.remove=true [Spark Branch]
> ---------------------------------------------------------------------------------------------------------
>
>                 Key: HIVE-7810
>                 URL: https://issues.apache.org/jira/browse/HIVE-7810
>             Project: Hive
>          Issue Type: Task
>          Components: Spark
>            Reporter: Na Yang
>            Assignee: Na Yang
>
> Insert overwrite table query has strange behavior when 
> set hive.optimize.union.remove=true
> set hive.mapred.supports.subdirectories=true;
> We expect the following two sets of queries return the same set of data result, but they do not. 
> 1)
> {noformat}
> insert overwrite table outputTbl1
> SELECT * FROM
> (
> select key, 1 as values from inputTbl1
> union all
> select * FROM (
>   SELECT key, count(1) as values from inputTbl1 group by key
>   UNION ALL
>   SELECT key, 2 as values from inputTbl1
> ) a
> )b;
> select * from outputTbl1 order by key, values;
> {noformat}
> Below is the query result:
> {noformat}
> 1	1
> 1	2
> 2	1
> 2	2
> 3	1
> 3	2
> 7	1
> 7	2
> 8	2
> 8	2
> 8	2
> {noformat}
> 2) 
> {noformat}
> SELECT * FROM
> (
> select key, 1 as values from inputTbl1
> union all
> select * FROM (
>   SELECT key, count(1) as values from inputTbl1 group by key
>   UNION ALL
>   SELECT key, 2 as values from inputTbl1
> ) a
> )b order by key, values;
> {noformat}
> Below is the query result:
> {noformat}
> 1	1
> 1	1
> 1	2
> 2	1
> 2	1
> 2	2
> 3	1
> 3	1
> 3	2
> 7	1
> 7	1
> 7	2
> 8	1
> 8	1
> 8	2
> 8	2
> 8	2
> {noformat}
> Some data is missing in the first set of query result. 



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