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From "Alexander Pivovarov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-686) add UDF substring_index
Date Sun, 31 May 2015 05:41:17 GMT

    [ https://issues.apache.org/jira/browse/HIVE-686?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14566375#comment-14566375
] 

Alexander Pivovarov commented on HIVE-686:
------------------------------------------

Added the function description to the Language Manual https://cwiki.apache.org/confluence/display/Hive/LanguageManual+UDF#LanguageManualUDF-StringFunctions

> add UDF substring_index
> -----------------------
>
>                 Key: HIVE-686
>                 URL: https://issues.apache.org/jira/browse/HIVE-686
>             Project: Hive
>          Issue Type: New Feature
>          Components: UDF
>            Reporter: Namit Jain
>            Assignee: Alexander Pivovarov
>             Fix For: 1.3.0
>
>         Attachments: HIVE-686.1.patch, HIVE-686.1.patch, HIVE-686.patch, HIVE-686.patch
>
>
> SUBSTRING_INDEX(str,delim,count)
> Returns the substring from string str before count occurrences of the delimiter delim.
If count is positive, everything to the left of the final delimiter (counting from the left)
is returned. If count is negative, everything to the right of the final delimiter (counting
from the right) is returned. SUBSTRING_INDEX() performs a case-sensitive match when searching
for delim.
> Examples:
> {code}
> SELECT SUBSTRING_INDEX('www.mysql.com', '.', 3);
> --www.mysql.com
> SELECT SUBSTRING_INDEX('www.mysql.com', '.', 2);
> --www.mysql
> SELECT SUBSTRING_INDEX('www.mysql.com', '.', 1);
> --www
> SELECT SUBSTRING_INDEX('www.mysql.com', '.', 0);
> --''
> SELECT SUBSTRING_INDEX('www.mysql.com', '.', -1);
> --com
> SELECT SUBSTRING_INDEX('www.mysql.com', '.', -2);
> --mysql.com
> SELECT SUBSTRING_INDEX('www.mysql.com', '.', -3);
> --www.mysql.com
> {code}
> {code}
> --#delim does not exist in str
> SELECT SUBSTRING_INDEX('www.mysql.com', 'Q', 1);
> --www.mysql.com
> --#delim is 2 chars
> SELECT SUBSTRING_INDEX('www||mysql||com', '||', 2);
> --www||mysql
> --#delim is empty string
> SELECT SUBSTRING_INDEX('www.mysql.com', '', 2);
> --''
> --#str is empty string
> SELECT SUBSTRING_INDEX('', '.', 2);
> --''
> {code}
> {code}
> --#null params
> SELECT SUBSTRING_INDEX(null, '.', 1);
> --null
> SELECT SUBSTRING_INDEX('www.mysql.com', null, 1);
> --null
> SELECT SUBSTRING_INDEX('www.mysql.com', '.', null);
> --null
> {code}



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