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