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Posted to issues@hive.apache.org by "Stamatis Zampetakis (Jira)" <ji...@apache.org> on 2021/01/07 10:56:00 UTC
[jira] [Assigned] (HIVE-24601) Control CBO fallback behavior via
property
[ https://issues.apache.org/jira/browse/HIVE-24601?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Stamatis Zampetakis reassigned HIVE-24601:
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> 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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