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 '%floral%'
	) as profit
group by
	nation,
	o_year
order by
	nation,
	o_year desc;
                                                                                           QUERY PLAN                                                                                            
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 GroupAggregate  (cost=1276336.47..1276341.48 rows=143 width=46) (actual time=105799.456..109135.993 rows=175 loops=1)
   Group Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
   Buffers: shared hit=35498266 read=2170798 dirtied=3954 written=19787
   ->  Sort  (cost=1276336.47..1276336.83 rows=143 width=46) (actual time=105786.109..106893.489 rows=3237167 loops=1)
         Sort Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
         Sort Method: quicksort  Memory: 553531kB
         Buffers: shared hit=35498266 read=2170798 dirtied=3954 written=19787
         ->  Hash Join  (cost=67001.30..1276331.35 rows=143 width=46) (actual time=997.226..95597.798 rows=3237167 loops=1)
               Hash Cond: (supplier.s_nationkey = nation.n_nationkey)
               Buffers: shared hit=35498258 read=2170798 dirtied=3954 written=19787
               ->  Nested Loop  (cost=66999.74..1276327.11 rows=143 width=24) (actual time=997.156..92819.244 rows=3237167 loops=1)
                     Buffers: shared hit=35498254 read=2170798 dirtied=3954 written=19787
                     ->  Nested Loop  (cost=66999.31..1276257.81 rows=143 width=24) (actual time=997.124..48607.183 rows=3237167 loops=1)
                           Buffers: shared hit=23280202 read=1422347 dirtied=3831 written=11588
                           ->  Nested Loop  (cost=66999.01..1276211.67 rows=143 width=28) (actual time=997.106..37223.285 rows=3237167 loops=1)
                                 Buffers: shared hit=13551108 read=1422347 dirtied=3831 written=11588
                                 ->  Hash Join  (cost=66998.45..352681.09 rows=472464 width=16) (actual time=996.962..5346.809 rows=431508 loops=1)
                                       Hash Cond: (partsupp.ps_partkey = part.p_partkey)
                                       Buffers: shared hit=107539 read=103941 written=1686
                                       ->  Seq Scan on partsupp  (cost=0.00..250958.00 rows=8000000 width=12) (actual time=0.009..2170.680 rows=8000000 loops=1)
                                             Buffers: shared hit=89556 read=81402 written=839
                                       ->  Hash  (cost=65522.00..65522.00 rows=118116 width=4) (actual time=996.055..996.055 rows=107877 loops=1)
                                             Buckets: 131072  Batches: 1  Memory Usage: 4817kB
                                             Buffers: shared hit=17983 read=22539 written=847
                                             ->  Seq Scan on part  (cost=0.00..65522.00 rows=118116 width=4) (actual time=0.014..942.201 rows=107877 loops=1)
                                                   Filter: ((p_name)::text ~~ '%floral%'::text)
                                                   Rows Removed by Filter: 1892123
                                                   Buffers: shared hit=17983 read=22539 written=847
                                 ->  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..0.071 rows=8 loops=431508)
                                       Index Cond: (l_partkey = partsupp.ps_partkey)
                                       Filter: (partsupp.ps_suppkey = l_suppkey)
                                       Rows Removed by Filter: 23
                                       Buffers: shared hit=13443569 read=1318406 dirtied=3831 written=9902
                           ->  Index Scan using pk_supplier on supplier  (cost=0.29..0.31 rows=1 width=8) (actual time=0.003..0.003 rows=1 loops=3237167)
                                 Index Cond: (s_suppkey = lineitem.l_suppkey)
                                 Buffers: shared hit=9729094
                     ->  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=3237167)
                           Index Cond: (o_orderkey = lineitem.l_orderkey)
                           Buffers: shared hit=12218052 read=748451 dirtied=123 written=8199
               ->  Hash  (cost=1.25..1.25 rows=25 width=30) (actual time=0.020..0.020 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: 32.308 ms
 Execution time: 109240.325 ms
(46 rows)

COMMIT;
COMMIT