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 '%magenta%'
	) as profit
group by
	nation,
	o_year
order by
	nation,
	o_year desc;
                                                                                           QUERY PLAN                                                                                            
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 GroupAggregate  (cost=1397529.75..1397535.35 rows=160 width=46) (actual time=104305.730..107474.999 rows=175 loops=1)
   Group Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
   Buffers: shared hit=35553374 read=2291860 dirtied=3623 written=16627
   ->  Sort  (cost=1397529.75..1397530.15 rows=160 width=46) (actual time=104292.639..105294.368 rows=3252021 loops=1)
         Sort Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
         Sort Method: quicksort  Memory: 555620kB
         Buffers: shared hit=35553374 read=2291860 dirtied=3623 written=16627
         ->  Hash Join  (cost=67201.50..1397523.90 rows=160 width=46) (actual time=987.317..94743.525 rows=3252021 loops=1)
               Hash Cond: (supplier.s_nationkey = nation.n_nationkey)
               Buffers: shared hit=35553366 read=2291860 dirtied=3623 written=16627
               ->  Nested Loop  (cost=67199.94..1397519.33 rows=160 width=24) (actual time=987.238..91918.488 rows=3252021 loops=1)
                     Buffers: shared hit=35553362 read=2291860 dirtied=3623 written=16627
                     ->  Nested Loop  (cost=67199.51..1397441.79 rows=160 width=24) (actual time=987.209..48088.448 rows=3252021 loops=1)
                           Buffers: shared hit=23311681 read=1507430 dirtied=3473 written=9263
                           ->  Nested Loop  (cost=67199.21..1397390.17 rows=160 width=28) (actual time=987.196..37280.932 rows=3252021 loops=1)
                                 Buffers: shared hit=13537727 read=1507430 dirtied=3473 written=9263
                                 ->  Hash Join  (cost=67198.65..353497.00 rows=534035 width=16) (actual time=987.126..5004.080 rows=433928 loops=1)
                                       Hash Cond: (partsupp.ps_partkey = part.p_partkey)
                                       Buffers: shared hit=106300 read=105180 written=998
                                       ->  Seq Scan on partsupp  (cost=0.00..250958.00 rows=8000000 width=12) (actual time=0.007..2200.057 rows=8000000 loops=1)
                                             Buffers: shared hit=88556 read=82402 written=331
                                       ->  Hash  (cost=65522.00..65522.00 rows=134132 width=4) (actual time=985.050..985.050 rows=108482 loops=1)
                                             Buckets: 262144  Batches: 1  Memory Usage: 5862kB
                                             Buffers: shared hit=17744 read=22778 written=667
                                             ->  Seq Scan on part  (cost=0.00..65522.00 rows=134132 width=4) (actual time=0.018..945.708 rows=108482 loops=1)
                                                   Filter: ((p_name)::text ~~ '%magenta%'::text)
                                                   Rows Removed by Filter: 1891518
                                                   Buffers: shared hit=17744 read=22778 written=667
                                 ->  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=7 loops=433928)
                                       Index Cond: (l_partkey = partsupp.ps_partkey)
                                       Filter: (partsupp.ps_suppkey = l_suppkey)
                                       Rows Removed by Filter: 22
                                       Buffers: shared hit=13431427 read=1402250 dirtied=3473 written=8265
                           ->  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=3252021)
                                 Index Cond: (s_suppkey = lineitem.l_suppkey)
                                 Buffers: shared hit=9773954
                     ->  Index Scan using pk_orders on orders  (cost=0.43..0.47 rows=1 width=8) (actual time=0.012..0.013 rows=1 loops=3252021)
                           Index Cond: (o_orderkey = lineitem.l_orderkey)
                           Buffers: shared hit=12241681 read=784430 dirtied=150 written=7364
               ->  Hash  (cost=1.25..1.25 rows=25 width=30) (actual time=0.026..0.026 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=0.007..0.012 rows=25 loops=1)
                           Buffers: shared hit=1
 Planning time: 31.597 ms
 Execution time: 107548.736 ms
(46 rows)

COMMIT;
COMMIT