[jira] [Commented] (HIVE-7870) Insert overwrite table query does not generate correct task plan

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

    [ https://issues.apache.org/jira/browse/HIVE-7870?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14111003#comment-14111003 ] 

Na Yang commented on HIVE-7870:
-------------------------------

Hi Chao, the real problem of this issue is the hive.merge.sparkfiles=true, not hive.optimize.union.remove=true. If the hive.merge.sparkfiles are turned on, a lot of queries are not able to generate the right result. I think the root cause of this issue is the mr work for merging files which works for map reduce, but not spark. 

> Insert overwrite table query does not generate correct task plan
> ----------------------------------------------------------------
>
>                 Key: HIVE-7870
>                 URL: https://issues.apache.org/jira/browse/HIVE-7870
>             Project: Hive
>          Issue Type: Sub-task
>          Components: Spark
>            Reporter: Na Yang
>            Assignee: Chao
>              Labels: Spark-M1
>
> Insert overwrite table query does not generate correct task plan when hive.optimize.union.remove and hive.merge.sparkfiles properties are ON. 
> {noformat}
> set hive.optimize.union.remove=true
> set hive.merge.sparkfiles=true
> 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}
> 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}
> expected 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}
> Move work is not working properly and some data are missing during move.



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