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Posted to issues@hive.apache.org by "Damien Carol (JIRA)" <ji...@apache.org> on 2015/06/09 10:30:01 UTC
[jira] [Updated] (HIVE-686) add UDF substring_index

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

Damien Carol updated HIVE-686:
------------------------------
    Description: 
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:sql}
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:sql}
--#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:sql}
--#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}

  was:
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}


> 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, 2.0.0
>
>         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:sql}
> 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:sql}
> --#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:sql}
> --#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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