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

• Type: Improvement
• Status: Resolved
• Priority: Trivial
• Resolution: Fixed
• Fix Version/s: 0.9.0
• Assignee: Hyoungjun Kim
• Reporter: Hyoungjun Kim
• Created: 17/Jul/14 18:08
• Updated: 20/Jul/14 12:47
• Resolved: 20/Jul/14 12:43

Description

Currently Tajo's CONCAT function doesn't support multiple parameters and null parameter.

default> select concat('aaa', 'bbb', 'ccc');
ERROR: function concat(text,text,text) does not exist
default>

CONCAT function can be defined as follows.

default> select concat(null, 'aaa', null, 'bbb', 'ccc');
 concat
--------
 aaabbbccc