You are viewing a plain text version of this content. The canonical link for it is here.
Posted to dev@hive.apache.org by "Chao (JIRA)" <ji...@apache.org> on 2014/08/20 23:57:27 UTC
[jira] [Commented] (HIVE-7810) Insert overwrite table query has
strange behavior when set hive.optimize.union.remove=true [Spark Branch]
[ https://issues.apache.org/jira/browse/HIVE-7810?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14104667#comment-14104667 ]
Chao commented on HIVE-7810:
----------------------------
I ran explain on the two queries and noticed something strange:
1. for the first query, it generates FileSinks instead of Reduce
> 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.
--
This message was sent by Atlassian JIRA
(v6.2#6252)