I'm a foreigner and cannot attend my arraignment, what happens

You won't be able to get back into the country (unless you are a citizen) with an open warrant.

My colleague is correct, usually a warrant is issued and if it is entered into the NCIC system you will be potentially detained if apprehended. If you have or obtain an attorney, they may be able to temporarily head off trouble by explaining the situation to the Court as the situation is not unusual. But you will eventually need to clear up the matter in person.