[jira] [Commented] (HIVE-12092) SARGS: UDFLike prefix cases needs to be translated into >= sargs

["Gunther Hagleitner (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-12092?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15049247#comment-15049247 ] 

Gunther Hagleitner commented on HIVE-12092:
-------------------------------------------

In your example above you say: x like "https:%" -> x >= "https:". Doesn't it also guarantee that: x < "https;" and if so wouldn't that narrow the space further?

> 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, HIVE-12092.3.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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