Odd behaviour with Active Record

Hey guys,

for your information i'm using CI 3:

Can anyone of you reproduce what i've experienced;
I've a compound select query like:

PHP Code:

$query = $this->db

->select("ur.*, ca.name, GROUP_CONCAT(ug.id SEPARATOR ',') AS usergrouplist",false)... 


Now, my problem is the generated Query

Code:

SELECT ur.*, ca.name, GROUP_CONCAT(ug.id SEPARATOR ', ') AS usergrouplist

There is a space after the comma
Am i overlooking something or is there a bug in CI ?