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Posted to dev@hive.apache.org by "John Sichi (JIRA)" <ji...@apache.org> on 2010/11/12 01:30:14 UTC
[jira] Commented: (HIVE-1586) prune operators for empty inputs
[ https://issues.apache.org/jira/browse/HIVE-1586?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12931283#action_12931283 ]
John Sichi commented on HIVE-1586:
----------------------------------
Testing email notifications.
> prune operators for empty inputs
> --------------------------------
>
> Key: HIVE-1586
> URL: https://issues.apache.org/jira/browse/HIVE-1586
> Project: Hive
> Issue Type: Improvement
> Components: Query Processor
> Affects Versions: 0.6.0
> Reporter: John Sichi
> Assignee: John Sichi
> Fix For: 0.7.0
>
>
> Given this:
> create view v as
> select * from (
> select *,'T1' as m from pokes
> union all
> select *,'T2' as m from pokes2) u;
> select * from v
> where m='T2';
> When we optimize the query, we can prune away all inputs to the union other than the one which references pokes2.
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