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Posted to issues@hive.apache.org by "Vineet Garg (JIRA)" <ji...@apache.org> on 2019/08/01 21:42:00 UTC

[jira] [Assigned] (HIVE-22074) Slow compilation due to IN to OR transformation

     [ https://issues.apache.org/jira/browse/HIVE-22074?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vineet Garg reassigned HIVE-22074:
----------------------------------


> Slow compilation due to IN to OR transformation
> -----------------------------------------------
>
>                 Key: HIVE-22074
>                 URL: https://issues.apache.org/jira/browse/HIVE-22074
>             Project: Hive
>          Issue Type: Improvement
>          Components: Logical Optimizer
>            Reporter: Vineet Garg
>            Assignee: Vineet Garg
>            Priority: Major
>
> Currently Hive transform IN expressions to OR to apply various CBO rules. This incur significant performance hit if IN consist of large number of expressions. 
> It is better to not transform IN expressions to OR in such cases because overall benefit of various optimizations/transformations is unrealized due to the compilation overhead



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