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https://issues.apache.org/jira/browse/HIVE-12092?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15000690#comment-15000690
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Gopal V commented on HIVE-12092:
--------------------------------
With this patch NOT LIKE is handled is by returning only YES_NO & NO from the
LIKE SARG.
NOT(YES_NO) = YES_NO and NOT(NO) = YES
so the implementation also works if there is a negation.
> 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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