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Posted to issues@hive.apache.org by "Gopal V (JIRA)" <ji...@apache.org> on 2015/10/06 02:02:26 UTC

[jira] [Assigned] (HIVE-12040) CBO: Use CBO, even for the 1 JOIN + GROUP BY case

     [ https://issues.apache.org/jira/browse/HIVE-12040?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gopal V reassigned HIVE-12040:
------------------------------

    Assignee: Gopal V

> CBO: Use CBO, even for the 1 JOIN + GROUP BY case
> -------------------------------------------------
>
>                 Key: HIVE-12040
>                 URL: https://issues.apache.org/jira/browse/HIVE-12040
>             Project: Hive
>          Issue Type: Improvement
>          Components: Logical Optimizer
>    Affects Versions: 1.3.0, 2.0.0
>            Reporter: Gopal V
>            Assignee: Gopal V
>             Fix For: 1.3.0, 2.0.0
>
>
> Hive CBO kicks in for a query only if a query has >1 joins, which is an archaic result of only re-ordering joins in the original impl.
> As more group-by & filter optimizers have been added, modify the CBO impl to kick in even if the query has a single JOIN.



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