BEGIN;
BEGIN
EXPLAIN (ANALYZE, BUFFERS)
select
	nation,
	o_year,
	sum(amount) as sum_profit
from
	(
		select
			n_name as nation,
			extract(year from o_orderdate) as o_year,
			l_extendedprice * (1 - l_discount) - ps_supplycost * l_quantity as amount
		from
			part,
			supplier,
			lineitem,
			partsupp,
			orders,
			nation
		where
			s_suppkey = l_suppkey
			and ps_suppkey = l_suppkey
			and ps_partkey = l_partkey
			and p_partkey = l_partkey
			and o_orderkey = l_orderkey
			and s_nationkey = n_nationkey
			and p_name like '%navy%'
	) as profit
group by
	nation,
	o_year
order by
	nation,
	o_year desc;
                                                                                           QUERY PLAN                                                                                            
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 GroupAggregate  (cost=1262411.62..1262416.55 rows=141 width=46) (actual time=117822.558..121147.275 rows=175 loops=1)
   Group Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
   Buffers: shared hit=35366773 read=2481372 dirtied=14885 written=21495
   ->  Sort  (cost=1262411.62..1262411.97 rows=141 width=46) (actual time=117810.423..118994.309 rows=3251099 loops=1)
         Sort Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
         Sort Method: quicksort  Memory: 555490kB
         Buffers: shared hit=35366773 read=2481372 dirtied=14885 written=21495
         ->  Hash Join  (cost=66976.27..1262406.58 rows=141 width=46) (actual time=1066.871..107316.162 rows=3251099 loops=1)
               Hash Cond: (supplier.s_nationkey = nation.n_nationkey)
               Buffers: shared hit=35366765 read=2481372 dirtied=14885 written=21495
               ->  Nested Loop  (cost=66974.71..1262402.38 rows=141 width=24) (actual time=1066.797..104036.782 rows=3251099 loops=1)
                     Buffers: shared hit=35366761 read=2481372 dirtied=14885 written=21495
                     ->  Nested Loop  (cost=66974.27..1262334.04 rows=141 width=24) (actual time=1066.668..54273.269 rows=3251099 loops=1)
                           Buffers: shared hit=23168610 read=1657507 dirtied=14587 written=14668
                           ->  Nested Loop  (cost=66973.98..1262288.54 rows=141 width=28) (actual time=1066.643..41809.202 rows=3251099 loops=1)
                                 Buffers: shared hit=13397566 read=1657507 dirtied=14587 written=14668
                                 ->  Hash Join  (cost=66973.41..352575.93 rows=464452 width=16) (actual time=1066.565..5952.417 rows=433248 loops=1)
                                       Hash Cond: (partsupp.ps_partkey = part.p_partkey)
                                       Buffers: shared hit=83489 read=127991 written=597
                                       ->  Seq Scan on partsupp  (cost=0.00..250958.00 rows=8000000 width=12) (actual time=0.005..2529.640 rows=8000000 loops=1)
                                             Buffers: shared hit=69829 read=101129 written=554
                                       ->  Hash  (cost=65522.00..65522.00 rows=116113 width=4) (actual time=1065.736..1065.736 rows=108312 loops=1)
                                             Buckets: 131072  Batches: 1  Memory Usage: 4832kB
                                             Buffers: shared hit=13660 read=26862 written=43
                                             ->  Seq Scan on part  (cost=0.00..65522.00 rows=116113 width=4) (actual time=0.021..1011.872 rows=108312 loops=1)
                                                   Filter: ((p_name)::text ~~ '%navy%'::text)
                                                   Rows Removed by Filter: 1891688
                                                   Buffers: shared hit=13660 read=26862 written=43
                                 ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=0.56..1.95 rows=1 width=24) (actual time=0.016..0.080 rows=8 loops=433248)
                                       Index Cond: (l_partkey = partsupp.ps_partkey)
                                       Filter: (partsupp.ps_suppkey = l_suppkey)
                                       Rows Removed by Filter: 23
                                       Buffers: shared hit=13314077 read=1529516 dirtied=14587 written=14071
                           ->  Index Scan using pk_supplier on supplier  (cost=0.29..0.31 rows=1 width=8) (actual time=0.003..0.003 rows=1 loops=3251099)
                                 Index Cond: (s_suppkey = lineitem.l_suppkey)
                                 Buffers: shared hit=9771044
                     ->  Index Only Scan using orders_o_orderkey_o_orderdate_idx on orders  (cost=0.43..0.47 rows=1 width=8) (actual time=0.014..0.015 rows=1 loops=3251099)
                           Index Cond: (o_orderkey = lineitem.l_orderkey)
                           Heap Fetches: 3251099
                           Buffers: shared hit=12198151 read=823865 dirtied=298 written=6827
               ->  Hash  (cost=1.25..1.25 rows=25 width=30) (actual time=0.021..0.021 rows=25 loops=1)
                     Buckets: 1024  Batches: 1  Memory Usage: 10kB
                     Buffers: shared hit=1
                     ->  Seq Scan on nation  (cost=0.00..1.25 rows=25 width=30) (actual time=0.005..0.009 rows=25 loops=1)
                           Buffers: shared hit=1
 Planning time: 33.387 ms
 Execution time: 121190.914 ms
(47 rows)

COMMIT;
COMMIT