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Posted to dev@hive.apache.org by "Namit Jain (JIRA)" <ji...@apache.org> on 2008/11/20 20:34:44 UTC
[jira] Updated: (HIVE-75) limit does not work if applied to outer
most block and it is not a query
[ https://issues.apache.org/jira/browse/HIVE-75?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Namit Jain updated HIVE-75:
---------------------------
Attachment: patch1.txt
> limit does not work if applied to outer most block and it is not a query
> ------------------------------------------------------------------------
>
> Key: HIVE-75
> URL: https://issues.apache.org/jira/browse/HIVE-75
> Project: Hadoop Hive
> Issue Type: Bug
> Reporter: Namit Jain
> Assignee: Namit Jain
> Attachments: patch1.txt
>
>
> limit does not work if applied to outer most block and it is not a query
> For eg
> insert into T1 select ... from T2 limit 10;
> will be executed as a map-job only.
> which means that the total number of rows in T1 is bounded by 10 * number of mappers.
> We need another map-reduce job to fix this or the move task needs to be modified.
> For now, the simpler fix of another map-reduce job should be ok, in future we can further optimize it by modifying the move task
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