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From "Alexander Pivovarov (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-686) add UDF substring_index
Date Wed, 27 May 2015 03:38:17 GMT

     [ https://issues.apache.org/jira/browse/HIVE-686?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Alexander Pivovarov updated HIVE-686:
-------------------------------------
    Attachment: HIVE-686.1.patch

patch #1
- derive substring_index from GenericUDF
- add Junit and qtest tests

> 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
>         Attachments: 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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