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 '%turquoise%'
	) as profit
group by
	nation,
	o_year
order by
	nation,
	o_year desc;
                                                                                  QUERY PLAN                                                                                   
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 GroupAggregate  (cost=3234992.28..3234995.82 rows=101 width=46) (actual time=269136.360..272594.377 rows=175 loops=1)
   Buffers: shared hit=30028081 read=821794 dirtied=117 written=18156
   ->  Sort  (cost=3234992.28..3234992.53 rows=101 width=46) (actual time=269123.360..270109.323 rows=3251609 loops=1)
         Sort Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
         Sort Method: quicksort  Memory: 555562kB
         Buffers: shared hit=30028081 read=821794 dirtied=117 written=18156
         ->  Nested Loop  (cost=2572554.79..3234988.92 rows=101 width=46) (actual time=123259.494..247470.283 rows=3251609 loops=1)
               Buffers: shared hit=30028073 read=821794 dirtied=117 written=18156
               ->  Nested Loop  (cost=2572554.79..3234960.11 rows=101 width=24) (actual time=123259.408..227883.849 rows=3251609 loops=1)
                     Buffers: shared hit=23524855 read=821794 dirtied=117 written=18156
                     ->  Nested Loop  (cost=2572554.79..3234760.69 rows=101 width=24) (actual time=123259.325..159290.783 rows=3251609 loops=1)
                           Buffers: shared hit=10852614 read=469791 written=8242
                           ->  Merge Join  (cost=2572554.79..3234730.99 rows=102 width=28) (actual time=123259.270..136036.337 rows=3251609 loops=1)
                                 Merge Cond: ((partsupp.ps_partkey = lineitem.l_partkey) AND (partsupp.ps_suppkey = lineitem.l_suppkey))
                                 Buffers: shared hit=1079922 read=469791 written=8242
                                 ->  Index Scan using pk_partsupp on partsupp  (cost=0.00..603091.33 rows=8000000 width=12) (actual time=0.017..6138.152 rows=7999965 loops=1)
                                       Buffers: shared hit=330709 read=103500 written=8230
                                 ->  Sort  (cost=2572554.78..2578916.08 rows=2544517 width=28) (actual time=123259.134..125579.889 rows=3251609 loops=1)
                                       Sort Key: part.p_partkey, lineitem.l_suppkey
                                       Sort Method: quicksort  Memory: 352336kB
                                       Buffers: shared hit=749213 read=366291 written=12
                                       ->  Hash Join  (cost=66573.02..2301831.40 rows=2544517 width=28) (actual time=1277.023..118883.906 rows=3251609 loops=1)
                                             Hash Cond: (lineitem.l_partkey = part.p_partkey)
                                             Buffers: shared hit=749210 read=366291 written=12
                                             ->  Seq Scan on lineitem  (cost=0.00..1680222.51 rows=60524651 width=24) (actual time=0.043..20985.647 rows=60044082 loops=1)
                                                   Buffers: shared hit=708685 read=366291 written=12
                                             ->  Hash  (cost=65522.00..65522.00 rows=84082 width=4) (actual time=1276.761..1276.761 rows=108348 loops=1)
                                                   Buckets: 16384  Batches: 1  Memory Usage: 3810kB
                                                   Buffers: shared hit=40522
                                                   ->  Seq Scan on part  (cost=0.00..65522.00 rows=84082 width=4) (actual time=0.031..1213.187 rows=108348 loops=1)
                                                         Filter: ((p_name)::text ~~ '%turquoise%'::text)
                                                         Rows Removed by Filter: 1891652
                                                         Buffers: shared hit=40522
                           ->  Index Scan using pk_supplier on supplier  (cost=0.00..0.28 rows=1 width=8) (actual time=0.006..0.006 rows=1 loops=3251609)
                                 Index Cond: (s_suppkey = lineitem.l_suppkey)
                                 Buffers: shared hit=9772692
                     ->  Index Scan using pk_orders on orders  (cost=0.00..1.96 rows=1 width=8) (actual time=0.020..0.020 rows=1 loops=3251609)
                           Index Cond: (o_orderkey = lineitem.l_orderkey)
                           Buffers: shared hit=12672241 read=352003 dirtied=117 written=9914
               ->  Index Scan using pk_nation on nation  (cost=0.00..0.27 rows=1 width=30) (actual time=0.003..0.004 rows=1 loops=3251609)
                     Index Cond: (n_nationkey = supplier.s_nationkey)
                     Buffers: shared hit=6503218
 Total runtime: 272682.882 ms
(43 rows)

COMMIT;
COMMIT