If any person has the following UAE visa he/she can fly direct to qatar and will get on arrival visa for 14 days to 1 month , its for all nationality. Not only Qatar they can fly to Oman,Bahrain,Kuwait and can get on arrival visa but not Saudi Arabia.
1) UAE investor visa
2) UAE Director visa
3) General Manager / Marketing /Sales Manager / Accountant visa etc.

Others wont get on arrival visa.