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From "Damien Carol (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-9984) JoinReorder's getOutputSize is exponential
Date Thu, 19 Mar 2015 11:38:38 GMT

    [ https://issues.apache.org/jira/browse/HIVE-9984?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14368941#comment-14368941
] 

Damien Carol commented on HIVE-9984:
------------------------------------

Do you want to wait the release of 1.2.0 to update the wiki or we can do it now?

> JoinReorder's getOutputSize is exponential
> ------------------------------------------
>
>                 Key: HIVE-9984
>                 URL: https://issues.apache.org/jira/browse/HIVE-9984
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Gunther Hagleitner
>            Assignee: Gopal V
>              Labels: TODOC1.2
>             Fix For: 1.2.0
>
>         Attachments: HIVE-9984.1.patch, HIVE-9984.2.patch
>
>
> Found by [~mmokhtar]. Causes major issues in large plans (50+ joins). Simple fix would
be to memoize the recursion. There should also be a flag to switch this opt off.



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