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 '%navajo%'
	) as profit
group by
	nation,
	o_year
order by
	nation,
	o_year desc;
                                                                                      QUERY PLAN                                                                                      
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 GroupAggregate  (cost=934978.73..934981.99 rows=93 width=46) (actual time=93993.616..96868.201 rows=175 loops=1)
   Group Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
   Buffers: shared hit=36137019 read=2054741 dirtied=10803 written=16492
   ->  Sort  (cost=934978.73..934978.97 rows=93 width=46) (actual time=93983.422..94640.980 rows=3282519 loops=1)
         Sort Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
         Sort Method: quicksort  Memory: 559909kB
         Buffers: shared hit=36137019 read=2054741 dirtied=10803 written=16492
         ->  Hash Join  (cost=66500.82..934975.69 rows=93 width=46) (actual time=994.344..87805.341 rows=3282519 loops=1)
               Hash Cond: (supplier.s_nationkey = nation.n_nationkey)
               Buffers: shared hit=36137011 read=2054741 dirtied=10803 written=16492
               ->  Nested Loop  (cost=66499.25..934972.39 rows=93 width=24) (actual time=994.279..84455.572 rows=3282519 loops=1)
                     Buffers: shared hit=36137007 read=2054741 dirtied=10803 written=16492
                     ->  Nested Loop  (cost=66498.82..934927.31 rows=93 width=24) (actual time=994.261..51208.837 rows=3282519 loops=1)
                           Buffers: shared hit=23582999 read=1460604 dirtied=10701 written=10179
                           ->  Nested Loop  (cost=66498.53..934897.31 rows=93 width=28) (actual time=994.250..40478.608 rows=3282519 loops=1)
                                 Buffers: shared hit=13717889 read=1460604 dirtied=10701 written=10179
                                 ->  Hash Join  (cost=66497.96..350547.58 rows=309162 width=16) (actual time=994.137..5099.947 rows=437784 loops=1)
                                       Hash Cond: (partsupp.ps_partkey = part.p_partkey)
                                       Buffers: shared hit=50260 read=161220 written=1229
                                       ->  Seq Scan on partsupp  (cost=0.00..250958.00 rows=8000000 width=12) (actual time=0.005..2365.966 rows=8000000 loops=1)
                                             Buffers: shared hit=45094 read=125864 written=1186
                                       ->  Hash  (cost=65522.00..65522.00 rows=78077 width=4) (actual time=993.640..993.640 rows=109446 loops=1)
                                             Buckets: 131072  Batches: 1  Memory Usage: 4872kB
                                             Buffers: shared hit=5166 read=35356 written=43
                                             ->  Seq Scan on part  (cost=0.00..65522.00 rows=78077 width=4) (actual time=0.010..953.771 rows=109446 loops=1)
                                                   Filter: ((p_name)::text ~~ '%navajo%'::text)
                                                   Rows Removed by Filter: 1890554
                                                   Buffers: shared hit=5166 read=35356 written=43
                                 ->  Index Scan using lineitem_l_partkey_l_quantity_idx on lineitem  (cost=0.56..1.88 rows=1 width=24) (actual time=0.016..0.078 rows=7 loops=437784)
                                       Index Cond: (l_partkey = partsupp.ps_partkey)
                                       Filter: (partsupp.ps_suppkey = l_suppkey)
                                       Rows Removed by Filter: 22
                                       Buffers: shared hit=13667629 read=1299384 dirtied=10701 written=8950
                           ->  Index Scan using pk_supplier on supplier  (cost=0.29..0.31 rows=1 width=8) (actual time=0.002..0.003 rows=1 loops=3282519)
                                 Index Cond: (s_suppkey = lineitem.l_suppkey)
                                 Buffers: shared hit=9865110
                     ->  Index Scan using pk_orders on orders  (cost=0.43..0.47 rows=1 width=8) (actual time=0.009..0.010 rows=1 loops=3282519)
                           Index Cond: (o_orderkey = lineitem.l_orderkey)
                           Buffers: shared hit=12554008 read=594137 dirtied=102 written=6313
               ->  Hash  (cost=1.25..1.25 rows=25 width=30) (actual time=0.019..0.019 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=0.004..0.007 rows=25 loops=1)
                           Buffers: shared hit=1
 Planning time: 33.010 ms
 Execution time: 96900.842 ms
(46 rows)

COMMIT;
COMMIT