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From "Gopal V (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-12092) SARGS: UDFLike prefix cases needs to be translated into >= sargs
Date Fri, 06 Nov 2015 07:46:27 GMT

    [ https://issues.apache.org/jira/browse/HIVE-12092?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14993300#comment-14993300
] 

Gopal V commented on HIVE-12092:
--------------------------------

[~sershe]: fixed that. 

bq. Or, I wonder if it could just be done when creating SARG from UDF, so that SARG-specific
code stays SARG-specific without Hive making assumptions about what SARG can and cannot do?

That's exactly where the code is plugged in right now - the AST convertor.  I haven't got
any code in the SARGs codebase as such - this is written this way so that it doesn't add a
ql/ dep into ORC.

> SARGS: UDFLike prefix cases needs to be translated into >= sargs
> ----------------------------------------------------------------
>
>                 Key: HIVE-12092
>                 URL: https://issues.apache.org/jira/browse/HIVE-12092
>             Project: Hive
>          Issue Type: Improvement
>          Components: Logical Optimizer
>    Affects Versions: 1.3.0, 2.0.0
>            Reporter: Gopal V
>            Assignee: Gopal V
>         Attachments: HIVE-12092.1.patch, HIVE-12092.2.patch
>
>
> A query which follows the following format
> {{select * from table where access_url like "https:%" ;}}
> needs to rewrite SARGs as 
> {{access_url >= 'https:'}}
> to get a significant hit-rate on a simple expression.



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