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https://issues.apache.org/jira/browse/HIVE-18055?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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wan kun updated HIVE-18055:
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Attachment: HIVE-18055-branch-1.2.patch
> cache like pattern object using map object in like function
> -----------------------------------------------------------
>
> Key: HIVE-18055
> URL: https://issues.apache.org/jira/browse/HIVE-18055
> Project: Hive
> Issue Type: Improvement
> Components: Query Processor
> Reporter: wan kun
> Assignee: wan kun
> Priority: Minor
> Fix For: 1.2.3
>
> Attachments: HIVE-18055-branch-1.2.patch
>
> Original Estimate: 168h
> Remaining Estimate: 168h
>
> Now, only one pattern object was cached in the like function. If the like
> function is working on one column, the pattern object will be generated
> continuously for the regular expression matching. It's very inefficient. So
> should we use LRU MAP to cache a batch of objects ?
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