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From "wan kun (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-18055) cache like pattern object using map object in like function
Date Tue, 14 Nov 2017 10:20:00 GMT

     [ https://issues.apache.org/jira/browse/HIVE-18055?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

wan kun updated HIVE-18055:
---------------------------
    Attachment: HIVE-18055.2-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, HIVE-18055.2-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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