[jira] [Commented] (TAJO-956) CONCAT should be support multiple params and null param.

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/TAJO-956?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14066012#comment-14066012 ] 

ASF GitHub Bot commented on TAJO-956:
-------------------------------------

GitHub user babokim opened a pull request:

    https://github.com/apache/tajo/pull/81

    TAJO-956: CONCAT should be support multiple params and null param.

    

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/babokim/tajo TAJO-956

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/tajo/pull/81.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #81
    
----
commit f6a5b60b7a27524c55a651b78adc813a92300b76
Author: 김형준 <ba...@babokim-mbp.server.gruter.com>
Date:   2014-07-18T04:32:44Z

    TAJO-956: CONCAT should be support multiple params and null param.

----


> CONCAT should be support multiple params and null param.
> --------------------------------------------------------
>
>                 Key: TAJO-956
>                 URL: https://issues.apache.org/jira/browse/TAJO-956
>             Project: Tajo
>          Issue Type: Improvement
>            Reporter: Hyoungjun Kim
>            Assignee: Hyoungjun Kim
>            Priority: Trivial
>
> Currently Tajo's CONCAT function doesn't support multiple parameters and null parameter.
> {noformat}
> default> select concat('aaa', 'bbb', 'ccc');
> ERROR: function concat(text,text,text) does not exist
> default>
> {noformat}
> CONCAT function can be defined as follows.
> {noformat}
> default> select concat(null, 'aaa', null, 'bbb', 'ccc');
>  concat
> --------
>  aaabbbccc
> {noformat}



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