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From "Olaf Flebbe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-12417) Support for exclamation mark missing in regexp
Date Wed, 25 Nov 2015 19:15:10 GMT

    [ https://issues.apache.org/jira/browse/HIVE-12417?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15027413#comment-15027413
] 

Olaf Flebbe commented on HIVE-12417:
------------------------------------

I do not think, since the documentation in wiki was right and the implementation wrong.

> Support for exclamation mark missing in regexp
> ----------------------------------------------
>
>                 Key: HIVE-12417
>                 URL: https://issues.apache.org/jira/browse/HIVE-12417
>             Project: Hive
>          Issue Type: Bug
>    Affects Versions: 1.2.1
>            Reporter: Olaf Flebbe
>            Assignee: Olaf Flebbe
>             Fix For: 1.3.0, 2.0.0
>
>         Attachments: HIVE-12417.1.patch, HIVE-12417.2.patch
>
>
> with HIVE-6013 gets support for regular expressions. However, die ! character is valid,
too. It is needed for expressions like 
> {code}
> set hive.support.quoted.identifiers = none;
> select `^(?!donotuseme).*$` from table;
> {code}
> which is the idiom to select all but column {{donotuseme}} .
> See http://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html for a reference
of supported chars in Java regexp.
> The patch simply fixes the lexer to support '!' as REGEX char. And does simply work.
> Please review. 
> If you like to have an iTest for it, I beg you to help me. I tried several days on a
different issue to figure out how it is supposed to work and failed miserably.



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