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From "Ashutosh Chauhan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-7203) Optimize limit 0
Date Wed, 11 Jun 2014 16:47:02 GMT

    [ https://issues.apache.org/jira/browse/HIVE-7203?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14027998#comment-14027998
] 

Ashutosh Chauhan commented on HIVE-7203:
----------------------------------------

Yup, this is only for outermost limit. Opportunity to optimize away inner subquery with limit
0 with null scan still exists, although thats not a common case. Yeah, schema will be retained
since as you said fetch task still exists which will have right schema.

> Optimize limit 0
> ----------------
>
>                 Key: HIVE-7203
>                 URL: https://issues.apache.org/jira/browse/HIVE-7203
>             Project: Hive
>          Issue Type: New Feature
>          Components: Query Processor
>            Reporter: Ashutosh Chauhan
>            Assignee: Ashutosh Chauhan
>         Attachments: HIVE-7203.1.patch, HIVE-7203.patch
>
>
> Some tools generate queries with limit 0. Lets optimize that.



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