Question: Tell me the total quantity of products bought by the customer called "Rodrick Heaney".
SQL: SELECT sum(t3.order_quantity) FROM customers AS t1 JOIN customer_orders AS t2 ON t1.customer_id  =  t2.customer_id JOIN order_items AS t3 ON t2.order_id  =  t3.order_id WHERE t1.customer_name  =  "Rodrick Heaney"