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 '%papaya%'
	) as profit
group by
	nation,
	o_year
order by
	nation,
	o_year desc;
                                                                                  QUERY PLAN                                                                                   
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 GroupAggregate  (cost=3476619.02..3476623.71 rows=134 width=46) (actual time=96454.173..99512.738 rows=175 loops=1)
   Buffers: shared hit=29952017 read=972307 written=7885
   ->  Sort  (cost=3476619.02..3476619.35 rows=134 width=46) (actual time=96441.739..97298.017 rows=3260846 loops=1)
         Sort Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
         Sort Method: quicksort  Memory: 556861kB
         Buffers: shared hit=29952017 read=972307 written=7885
         ->  Nested Loop  (cost=2807939.26..3476614.28 rows=134 width=46) (actual time=36661.227..80118.743 rows=3260846 loops=1)
               Buffers: shared hit=29952009 read=972307 written=7885
               ->  Nested Loop  (cost=2807939.26..3476576.07 rows=134 width=24) (actual time=36661.158..74278.027 rows=3260846 loops=1)
                     Buffers: shared hit=23430317 read=972307 written=7885
                     ->  Nested Loop  (cost=2807939.26..3476315.02 rows=134 width=24) (actual time=36660.981..51052.104 rows=3260846 loops=1)
                           Buffers: shared hit=10663444 read=677958 written=2185
                           ->  Merge Join  (cost=2807939.26..3476275.99 rows=134 width=28) (actual time=36660.935..43500.438 rows=3260846 loops=1)
                                 Merge Cond: ((partsupp.ps_partkey = lineitem.l_partkey) AND (partsupp.ps_suppkey = lineitem.l_suppkey))
                                 Buffers: shared hit=863250 read=677958 written=2185
                                 ->  Index Scan using pk_partsupp on partsupp  (cost=0.00..603091.33 rows=8000000 width=12) (actual time=0.011..2978.449 rows=7999905 loops=1)
                                       Buffers: shared hit=416729 read=17476 written=2185
                                 ->  Sort  (cost=2807939.26..2816353.95 rows=3365879 width=28) (actual time=36660.635..38073.279 rows=3260846 loops=1)
                                       Sort Key: part.p_partkey, lineitem.l_suppkey
                                       Sort Method: quicksort  Memory: 353058kB
                                       Buffers: shared hit=446521 read=660482
                                       ->  Hash Join  (cost=66923.38..2443035.03 rows=3365879 width=28) (actual time=721.178..33990.512 rows=3260846 loops=1)
                                             Hash Cond: (lineitem.l_partkey = part.p_partkey)
                                             Buffers: shared hit=446518 read=660482
                                             ->  Seq Scan on lineitem  (cost=0.00..1666935.17 rows=60046017 width=24) (actual time=0.005..11014.088 rows=60045669 loops=1)
                                                   Buffers: shared hit=405993 read=660482
                                             ->  Hash  (cost=65522.00..65522.00 rows=112110 width=4) (actual time=721.041..721.041 rows=108628 loops=1)
                                                   Buckets: 16384  Batches: 1  Memory Usage: 3819kB
                                                   Buffers: shared hit=40522
                                                   ->  Seq Scan on part  (cost=0.00..65522.00 rows=112110 width=4) (actual time=0.022..692.000 rows=108628 loops=1)
                                                         Filter: ((p_name)::text ~~ '%papaya%'::text)
                                                         Rows Removed by Filter: 1891372
                                                         Buffers: shared hit=40522
                           ->  Index Scan using pk_supplier on supplier  (cost=0.00..0.28 rows=1 width=8) (actual time=0.002..0.002 rows=1 loops=3260846)
                                 Index Cond: (s_suppkey = lineitem.l_suppkey)
                                 Buffers: shared hit=9800194
                     ->  Index Scan using pk_orders on orders  (cost=0.00..1.94 rows=1 width=8) (actual time=0.006..0.007 rows=1 loops=3260846)
                           Index Cond: (o_orderkey = lineitem.l_orderkey)
                           Buffers: shared hit=12766873 read=294349 written=5700
               ->  Index Scan using pk_nation on nation  (cost=0.00..0.27 rows=1 width=30) (actual time=0.001..0.001 rows=1 loops=3260846)
                     Index Cond: (n_nationkey = supplier.s_nationkey)
                     Buffers: shared hit=6521692
 Total runtime: 99549.681 ms
(43 rows)

COMMIT;
COMMIT