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From "Lefty Leverenz (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-7810) Insert overwrite table query has strange behavior when set hive.optimize.union.remove=true [Spark Branch]
Date Sat, 30 May 2015 21:45:17 GMT

    [ https://issues.apache.org/jira/browse/HIVE-7810?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14566213#comment-14566213
] 

Lefty Leverenz commented on HIVE-7810:
--------------------------------------

ALTER TABLE ... CONCATENATE might need additional documentation too -- see [~lirui]'s comment
on HIVE-8043.

* [DDL -- Alter Table/Partition Concatenate | https://cwiki.apache.org/confluence/display/Hive/LanguageManual+DDL#LanguageManualDDL-AlterTable/PartitionConcatenate]
* [Rui Li's comment | https://issues.apache.org/jira/browse/HIVE-8043?focusedCommentId=14138824&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14138824]

> 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: Sub-task
>          Components: Spark
>            Reporter: Na Yang
>            Assignee: Na Yang
>              Labels: TODOC-SPARK, TODOC15
>             Fix For: 1.1.0
>
>         Attachments: HIVE-7810.1-spark.patch
>
>
> Insert overwrite table query has strange behavior when 
> set hive.optimize.union.remove=true
> set hive.mapred.supports.subdirectories=true;
> set hive.merge.mapfiles=true;
> set hive.merge.mapredfiles=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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