Given the table orders with columns customer_id, status, and amount, what will the following query return?

Given the table orders with columns customer_id, status, and amount, what will the following query return?

SELECT customer_id,
       SUM(amount) FILTER (WHERE status = 'shipped') AS shipped_total,
       SUM(amount) FILTER (WHERE status = 'pending') AS pending_total
FROM orders
GROUP BY customer_id;