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 '%lavender%'
	) as profit
group by
	nation,
	o_year
order by
	nation,
	o_year desc;
                                                                                           QUERY PLAN                                                                                            
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 GroupAggregate  (cost=1287749.02..1287754.06 rows=144 width=46) (actual time=107348.704..110937.137 rows=175 loops=1)
   Group Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
   Buffers: shared hit=35781300 read=2309619 dirtied=3630 written=16656
   ->  Sort  (cost=1287749.02..1287749.38 rows=144 width=46) (actual time=107335.175..108597.914 rows=3273646 loops=1)
         Sort Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
         Sort Method: quicksort  Memory: 558661kB
         Buffers: shared hit=35781300 read=2309619 dirtied=3630 written=16656
         ->  Hash Join  (cost=67026.34..1287743.85 rows=144 width=46) (actual time=823.414..95860.663 rows=3273646 loops=1)
               Hash Cond: (supplier.s_nationkey = nation.n_nationkey)
               Buffers: shared hit=35781292 read=2309619 dirtied=3630 written=16656
               ->  Nested Loop  (cost=67024.78..1287739.59 rows=144 width=24) (actual time=823.342..93049.611 rows=3273646 loops=1)
                     Buffers: shared hit=35781288 read=2309619 dirtied=3630 written=16656
                     ->  Nested Loop  (cost=67024.35..1287669.81 rows=144 width=24) (actual time=823.302..48290.940 rows=3273646 loops=1)
                           Buffers: shared hit=23480983 read=1497523 dirtied=3409 written=8923
                           ->  Nested Loop  (cost=67024.05..1287623.34 rows=144 width=28) (actual time=823.289..37126.504 rows=3273646 loops=1)
                                 Buffers: shared hit=13641902 read=1497523 dirtied=3409 written=8923
                                 ->  Hash Join  (cost=67023.49..352763.93 rows=478244 width=16) (actual time=823.206..4755.288 rows=436176 loops=1)
                                       Hash Cond: (partsupp.ps_partkey = part.p_partkey)
                                       Buffers: shared hit=128141 read=83339 written=344
                                       ->  Seq Scan on partsupp  (cost=0.00..250958.00 rows=8000000 width=12) (actual time=0.010..2182.507 rows=8000000 loops=1)
                                             Buffers: shared hit=87619 read=83339 written=344
                                       ->  Hash  (cost=65522.00..65522.00 rows=120119 width=4) (actual time=822.356..822.356 rows=109044 loops=1)
                                             Buckets: 131072  Batches: 1  Memory Usage: 4858kB
                                             Buffers: shared hit=40522
                                             ->  Seq Scan on part  (cost=0.00..65522.00 rows=120119 width=4) (actual time=0.013..786.379 rows=109044 loops=1)
                                                   Filter: ((p_name)::text ~~ '%lavender%'::text)
                                                   Rows Removed by Filter: 1890956
                                                   Buffers: shared hit=40522
                                 ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=0.56..1.94 rows=1 width=24) (actual time=0.015..0.072 rows=8 loops=436176)
                                       Index Cond: (l_partkey = partsupp.ps_partkey)
                                       Filter: (partsupp.ps_suppkey = l_suppkey)
                                       Rows Removed by Filter: 23
                                       Buffers: shared hit=13513761 read=1414184 dirtied=3409 written=8579
                           ->  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=3273646)
                                 Index Cond: (s_suppkey = lineitem.l_suppkey)
                                 Buffers: shared hit=9839081
                     ->  Index Scan using pk_orders on orders  (cost=0.43..0.47 rows=1 width=8) (actual time=0.013..0.013 rows=1 loops=3273646)
                           Index Cond: (o_orderkey = lineitem.l_orderkey)
                           Buffers: shared hit=12300305 read=812096 dirtied=221 written=7733
               ->  Hash  (cost=1.25..1.25 rows=25 width=30) (actual time=0.024..0.024 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=0.006..0.010 rows=25 loops=1)
                           Buffers: shared hit=1
 Planning time: 30.415 ms
 Execution time: 111007.072 ms
(46 rows)

COMMIT;
COMMIT