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

["Hyoungjun Kim (JIRA)" <ji...@apache.org>]

Hyoungjun Kim created TAJO-956:
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             Summary: 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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