Active Record join condition subquery escaped SELECT

[eluser]Unknown[/eluser]
When I try to join with a subquery as a condition, the SELECT statement from that subquery is escaped what leads to a database error.

Example :

Code:

$this->db->select('*');
$this->db->from('blogs');
$this->db->join('comments', 'comments.id = (SELECT id FROM blogs WHERE ....)');

$query = $this->db->get();

// Produces:
// SELECT * FROM `blogs`
// JOIN `comments` ON `comments`.`id` = (`SELECT` id FROM blogs WHERE ...)

Note that SELECT is the only word that is escaped from that subquery.