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Posted to issues@hive.apache.org by "Stamatis Zampetakis (Jira)" <ji...@apache.org> on 2021/01/28 15:29:00 UTC
[jira] [Commented] (HIVE-24601) Control CBO fallback behavior via
property
[ https://issues.apache.org/jira/browse/HIVE-24601?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17273805#comment-17273805 ]
Stamatis Zampetakis commented on HIVE-24601:
--------------------------------------------
Your feedback & help was much appreciated. Thanks [~kgyrtkirk] !
> 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
> Labels: pull-request-available
> Fix For: 4.0.0
>
> Time Spent: 3h 20m
> Remaining Estimate: 0h
>
> 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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