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 '%dark%'
	) as profit
group by
	nation,
	o_year
order by
	nation,
	o_year desc;
                                                                                           QUERY PLAN                                                                                            
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 GroupAggregate  (cost=1179134.21..1179138.69 rows=128 width=46) (actual time=106301.102..109119.029 rows=175 loops=1)
   Group Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
   Buffers: shared hit=35701523 read=2163334 dirtied=11284 written=25382
   ->  Sort  (cost=1179134.21..1179134.53 rows=128 width=46) (actual time=106291.264..107117.019 rows=3252754 loops=1)
         Sort Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
         Sort Method: quicksort  Memory: 555723kB
         Buffers: shared hit=35701523 read=2163334 dirtied=11284 written=25382
         ->  Hash Join  (cost=66851.17..1179129.73 rows=128 width=46) (actual time=865.504..92654.248 rows=3252754 loops=1)
               Hash Cond: (supplier.s_nationkey = nation.n_nationkey)
               Buffers: shared hit=35701515 read=2163334 dirtied=11284 written=25382
               ->  Nested Loop  (cost=66849.60..1179125.76 rows=128 width=24) (actual time=865.437..89898.978 rows=3252754 loops=1)
                     Buffers: shared hit=35701511 read=2163334 dirtied=11284 written=25382
                     ->  Nested Loop  (cost=66849.31..1179084.79 rows=127 width=28) (actual time=865.426..78658.269 rows=3252754 loops=1)
                           Buffers: shared hit=25924700 read=2163334 dirtied=11284 written=25382
                           ->  Nested Loop  (cost=66848.88..1179023.24 rows=127 width=28) (actual time=865.401..37283.224 rows=3252754 loops=1)
                                 Buffers: shared hit=13517022 read=1542161 dirtied=11075 written=18555
                                 ->  Hash Join  (cost=66848.31..352030.79 rows=422448 width=16) (actual time=865.262..5437.412 rows=433608 loops=1)
                                       Hash Cond: (partsupp.ps_partkey = part.p_partkey)
                                       Buffers: shared hit=71805 read=139675 written=1849
                                       ->  Seq Scan on partsupp  (cost=0.00..250958.00 rows=8000000 width=12) (actual time=0.004..2581.253 rows=8000000 loops=1)
                                             Buffers: shared hit=39111 read=131847 written=1809
                                       ->  Hash  (cost=65522.00..65522.00 rows=106105 width=4) (actual time=864.628..864.628 rows=108402 loops=1)
                                             Buckets: 131072  Batches: 1  Memory Usage: 4836kB
                                             Buffers: shared hit=32694 read=7828 written=40
                                             ->  Seq Scan on part  (cost=0.00..65522.00 rows=106105 width=4) (actual time=0.016..827.674 rows=108402 loops=1)
                                                   Filter: ((p_name)::text ~~ '%dark%'::text)
                                                   Rows Removed by Filter: 1891598
                                                   Buffers: shared hit=32694 read=7828 written=40
                                 ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=0.56..1.95 rows=1 width=24) (actual time=0.015..0.071 rows=8 loops=433608)
                                       Index Cond: (l_partkey = partsupp.ps_partkey)
                                       Filter: (partsupp.ps_suppkey = l_suppkey)
                                       Rows Removed by Filter: 23
                                       Buffers: shared hit=13445217 read=1402486 dirtied=11075 written=16706
                           ->  Index Scan using pk_orders on orders  (cost=0.43..0.47 rows=1 width=8) (actual time=0.012..0.012 rows=1 loops=3252754)
                                 Index Cond: (o_orderkey = lineitem.l_orderkey)
                                 Buffers: shared hit=12407678 read=621173 dirtied=209 written=6827
                     ->  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=3252754)
                           Index Cond: (s_suppkey = lineitem.l_suppkey)
                           Buffers: shared hit=9776811
               ->  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=0.005..0.011 rows=25 loops=1)
                           Buffers: shared hit=1
 Planning time: 31.791 ms
 Execution time: 109177.799 ms
(46 rows)

COMMIT;
COMMIT