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From "Stamatis Zampetakis (Jira)" <j...@apache.org>
Subject [jira] [Assigned] (HIVE-24601) Control CBO fallback behavior via property
Date Thu, 07 Jan 2021 10:56:00 GMT

     [ https://issues.apache.org/jira/browse/HIVE-24601?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Stamatis Zampetakis reassigned HIVE-24601:
------------------------------------------


> Control CBO fallback behavior via property
> ------------------------------------------
>
>                 Key: HIVE-24601
>                 URL: https://issues.apache.org/jira/browse/HIVE-24601
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Stamatis Zampetakis
>            Assignee: Stamatis Zampetakis
>            Priority: Major
>
> When CBO optimizer fails there is a fallback mechanism(HIVE-7413) that will retry to
process the query using the legacy Hive optimizer. 
> There are use-cases where this behavior is not desirable notably for the tests (HIVE-16058)
but also for end users who would like to disable the fall-back mechanism to avoid running
problematic queries without realizing.
> The goal of this issue is to introduce a dedicated Hive property controlling this behavior,{{hive.cbo.fallback.enable}},
for both tests and production. The default value should be true and tests should run with
this property set to false. 



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