Show the total number of rooms of the apartments in the building with short name "Columbus Square".
SELECT sum(T2.room_count) FROM Apartment_Buildings AS T1 JOIN Apartments AS T2 ON T1.building_id  =  T2.building_id WHERE T1.building_short_name  =  "Columbus Square"
SELECT sum(T2.room_count) FROM Apartment_Buildings AS T1 JOIN Apartments AS T2 ON T1.building_id  =  T2.building_id WHERE T1.building_short_name  =  "Columbus Square"
[{'sum(T2.room_count)': 29}]