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From "Vineet Garg (Jira)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-22637) Avoid cost based rules during generating expressions from AST
Date Fri, 13 Dec 2019 06:11:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-22637?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16995381#comment-16995381
] 

Vineet Garg commented on HIVE-22637:
------------------------------------

[~jcamachorodriguez] Can you take a look please?

> Avoid cost based rules during generating expressions from AST
> -------------------------------------------------------------
>
>                 Key: HIVE-22637
>                 URL: https://issues.apache.org/jira/browse/HIVE-22637
>             Project: Hive
>          Issue Type: Improvement
>          Components: Query Planning
>            Reporter: Vineet Garg
>            Assignee: Vineet Garg
>            Priority: Major
>         Attachments: HIVE-22637.1.patch, HIVE-22637.2.patch
>
>
> genExprNode uses default dispatcher which fire rules based on cost, computation of cost
is expensive and is likely un-necessary.



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