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 '%antique%'
	) as profit
group by
	nation,
	o_year
order by
	nation,
	o_year desc;
                                                                                  QUERY PLAN                                                                                   
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 GroupAggregate  (cost=3490774.44..3490779.10 rows=133 width=46) (actual time=261216.551..264801.815 rows=175 loops=1)
   Buffers: shared hit=29924859 read=868319 dirtied=74 written=10219
   ->  Sort  (cost=3490774.44..3490774.77 rows=133 width=46) (actual time=261203.303..262208.969 rows=3245348 loops=1)
         Sort Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
         Sort Method: quicksort  Memory: 554682kB
         Buffers: shared hit=29924859 read=868319 dirtied=74 written=10219
         ->  Nested Loop  (cost=2822346.92..3490769.75 rows=133 width=46) (actual time=117800.337..239470.437 rows=3245348 loops=1)
               Buffers: shared hit=29924851 read=868319 dirtied=74 written=10219
               ->  Nested Loop  (cost=2822346.92..3490731.82 rows=133 width=24) (actual time=117800.233..219987.586 rows=3245348 loops=1)
                     Buffers: shared hit=23434155 read=868319 dirtied=74 written=10219
                     ->  Nested Loop  (cost=2822346.92..3490469.21 rows=133 width=24) (actual time=117800.152..152236.347 rows=3245348 loops=1)
                           Buffers: shared hit=10741145 read=562282 written=2341
                           ->  Merge Join  (cost=2822346.92..3490430.48 rows=133 width=28) (actual time=117800.096..129404.440 rows=3245348 loops=1)
                                 Merge Cond: ((partsupp.ps_partkey = lineitem.l_partkey) AND (partsupp.ps_suppkey = lineitem.l_suppkey))
                                 Buffers: shared hit=987420 read=562282 written=2341
                                 ->  Index Scan using pk_partsupp on partsupp  (cost=0.00..603091.33 rows=8000000 width=12) (actual time=0.017..5081.672 rows=7999757 loops=1)
                                       Buffers: shared hit=422675 read=11523 written=2341
                                 ->  Sort  (cost=2822346.92..2830677.23 rows=3332124 width=28) (actual time=117799.858..120059.112 rows=3245348 loops=1)
                                       Sort Key: part.p_partkey, lineitem.l_suppkey
                                       Sort Method: quicksort  Memory: 351847kB
                                       Buffers: shared hit=564745 read=550759
                                       ->  Hash Join  (cost=66898.35..2461344.42 rows=3332124 width=28) (actual time=1444.741..114338.576 rows=3245348 loops=1)
                                             Hash Cond: (lineitem.l_partkey = part.p_partkey)
                                             Buffers: shared hit=564742 read=550759
                                             ->  Seq Scan on lineitem  (cost=0.00..1680222.51 rows=60524651 width=24) (actual time=0.024..21923.874 rows=60044082 loops=1)
                                                   Buffers: shared hit=524217 read=550759
                                             ->  Hash  (cost=65522.00..65522.00 rows=110108 width=4) (actual time=1444.481..1444.481 rows=108175 loops=1)
                                                   Buckets: 16384  Batches: 1  Memory Usage: 3804kB
                                                   Buffers: shared hit=40522
                                                   ->  Seq Scan on part  (cost=0.00..65522.00 rows=110108 width=4) (actual time=0.086..1381.209 rows=108175 loops=1)
                                                         Filter: ((p_name)::text ~~ '%antique%'::text)
                                                         Rows Removed by Filter: 1891825
                                                         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=3245348)
                                 Index Cond: (s_suppkey = lineitem.l_suppkey)
                                 Buffers: shared hit=9753725
                     ->  Index Scan using pk_orders on orders  (cost=0.00..1.96 rows=1 width=8) (actual time=0.019..0.020 rows=1 loops=3245348)
                           Index Cond: (o_orderkey = lineitem.l_orderkey)
                           Buffers: shared hit=12693010 read=306037 dirtied=74 written=7878
               ->  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=3245348)
                     Index Cond: (n_nationkey = supplier.s_nationkey)
                     Buffers: shared hit=6490696
 Total runtime: 264883.093 ms
(43 rows)

COMMIT;
COMMIT