BEGIN;
BEGIN
EXPLAIN
select
	supp_nation,
	cust_nation,
	l_year,
	sum(volume) as revenue
from
	(
		select
			n1.n_name as supp_nation,
			n2.n_name as cust_nation,
			extract(year from l_shipdate) as l_year,
			l_extendedprice * (1 - l_discount) as volume
		from
			supplier,
			lineitem,
			orders,
			customer,
			nation n1,
			nation n2
		where
			s_suppkey = l_suppkey
			and o_orderkey = l_orderkey
			and c_custkey = o_custkey
			and s_nationkey = n1.n_nationkey
			and c_nationkey = n2.n_nationkey
			and (
				(n1.n_name = 'INDONESIA' and n2.n_name = 'MOZAMBIQUE')
				or (n1.n_name = 'MOZAMBIQUE' and n2.n_name = 'INDONESIA')
			)
			and l_shipdate between date '1995-01-01' and date '1996-12-31'
	) as shipping
group by
	supp_nation,
	cust_nation,
	l_year
order by
	supp_nation,
	cust_nation,
	l_year;
                                                                                                        QUERY PLAN                                                                                                         
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 GroupAggregate  (cost=2352818.50..2354715.88 rows=58381 width=64)
   ->  Sort  (cost=2352818.50..2352964.45 rows=58381 width=64)
         Sort Key: n1.n_name, n2.n_name, (date_part('year'::text, (lineitem.l_shipdate)::timestamp without time zone))
         ->  Hash Join  (cost=894616.19..2348196.71 rows=58381 width=64)
               Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey))
               ->  Hash Join  (cost=889937.19..2313444.39 rows=1459880 width=72)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     ->  Bitmap Heap Scan on lineitem  (cost=387315.75..1727737.46 rows=18263114 width=20)
                           Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date))
                           ->  Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx  (cost=0.00..382749.97 rows=18263114 width=0)
                                 Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date))
                     ->  Hash  (cost=487618.47..487618.47 rows=1200238 width=60)
                           ->  Hash Join  (cost=15638.06..487618.47 rows=1200238 width=60)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 ->  Seq Scan on orders  (cost=0.00..403671.84 rows=15014984 width=8)
                                 ->  Hash  (cost=14139.26..14139.26 rows=119904 width=60)
                                       ->  Nested Loop  (cost=905.09..14139.26 rows=119904 width=60)
                                             ->  Nested Loop  (cost=0.00..28.00 rows=2 width=60)
                                                   Join Filter: (((n1.n_name = 'INDONESIA'::bpchar) AND (n2.n_name = 'MOZAMBIQUE'::bpchar)) OR ((n1.n_name = 'MOZAMBIQUE'::bpchar) AND (n2.n_name = 'INDONESIA'::bpchar)))
                                                   ->  Index Scan using pk_nation on nation n1  (cost=0.00..12.63 rows=25 width=30)
                                                   ->  Materialize  (cost=0.00..1.38 rows=25 width=30)
                                                         ->  Seq Scan on nation n2  (cost=0.00..1.25 rows=25 width=30)
                                             ->  Bitmap Heap Scan on customer  (cost=905.09..6455.63 rows=60000 width=8)
                                                   Recheck Cond: (c_nationkey = n2.n_nationkey)
                                                   ->  Bitmap Index Scan on customer_c_nationkey_c_custkey_idx  (cost=0.00..890.09 rows=60000 width=0)
                                                         Index Cond: (c_nationkey = n2.n_nationkey)
               ->  Hash  (cost=3179.00..3179.00 rows=100000 width=8)
                     ->  Seq Scan on supplier  (cost=0.00..3179.00 rows=100000 width=8)
(28 rows)

COMMIT;
COMMIT