Restaurants can be fairly large spaces... How far are you from the BG? 15 yds? more? Think back to your CHL qualification... When you had time to aim, fire, and think clearly. Did you score 50 points at 15 yards? Do you trust that you WILL remove his threat on your first shot? How about when your adrenaline is pumping, and you've got to get your gun up while sitting in a booth or exiting a booth, before the BG is alerted to you..
there are hundreds of variables here, but make sure if you're pulling your weapon that it's the absolute best decision.
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