Fix modify_column() issues (#2020)
diff --git a/system/database/drivers/mysql/mysql_forge.php b/system/database/drivers/mysql/mysql_forge.php
index 6c5dfc6..1e9145e 100644
--- a/system/database/drivers/mysql/mysql_forge.php
+++ b/system/database/drivers/mysql/mysql_forge.php
@@ -157,7 +157,7 @@
 		}
 
 		return $this->db->escape_identifiers($field['name'])
-			.(empty($field['new_name']) ? '' : $this->db->escape_identifiers($field['new_name']))
+			.(empty($field['new_name']) ? '' : ' '.$this->db->escape_identifiers($field['new_name']))
 			.' '.$field['type'].$field['length']
 			.$field['unsigned']
 			.$field['null']