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Posted to issues@hive.apache.org by "Gopal V (JIRA)" <ji...@apache.org> on 2016/05/25 21:12:13 UTC

[jira] [Updated] (HIVE-13196) UDFLike: reduce Regex NFA sizes

     [ https://issues.apache.org/jira/browse/HIVE-13196?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gopal V updated HIVE-13196:
---------------------------
    Status: Open  (was: Patch Available)

> UDFLike: reduce Regex NFA sizes
> -------------------------------
>
>                 Key: HIVE-13196
>                 URL: https://issues.apache.org/jira/browse/HIVE-13196
>             Project: Hive
>          Issue Type: Improvement
>          Components: UDF
>    Affects Versions: 2.0.0, 1.2.1, 1.3.0, 2.1.0
>            Reporter: Gopal V
>            Assignee: Gopal V
>            Priority: Minor
>         Attachments: HIVE-13196.1.patch
>
>
> The NFAs built from complex regexes in UDFLike are extremely complex and spend a lot of time doing simple expression matching with no backtracking.
> Prevent NFA -> DFA explosion by using reluctant regex matches instead of greedy matches.



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