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 '%pink%'
	) as profit
group by
	nation,
	o_year
order by
	nation,
	o_year desc;
                                                                                  QUERY PLAN                                                                                   
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 GroupAggregate  (cost=3250951.12..3250954.87 rows=107 width=46) (actual time=310856.245..314161.802 rows=175 loops=1)
   Buffers: shared hit=30209774 read=828880 dirtied=181 written=5375
   ->  Sort  (cost=3250951.12..3250951.39 rows=107 width=46) (actual time=310843.514..311747.424 rows=3272558 loops=1)
         Sort Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
         Sort Method: quicksort  Memory: 558508kB
         Buffers: shared hit=30209774 read=828880 dirtied=181 written=5375
         ->  Nested Loop  (cost=2587590.38..3250947.52 rows=107 width=46) (actual time=116842.828..289807.228 rows=3272558 loops=1)
               Buffers: shared hit=30209766 read=828880 dirtied=181 written=5375
               ->  Nested Loop  (cost=2587590.38..3250917.00 rows=107 width=24) (actual time=116841.060..261326.795 rows=3272558 loops=1)
                     Buffers: shared hit=23664650 read=828880 dirtied=181 written=5375
                     ->  Nested Loop  (cost=2587590.38..3250705.73 rows=107 width=24) (actual time=116840.994..167206.111 rows=3272558 loops=1)
                           Buffers: shared hit=10886280 read=499183 written=1733
                           ->  Merge Join  (cost=2587590.38..3250674.57 rows=107 width=28) (actual time=116840.954..132439.034 rows=3272558 loops=1)
                                 Merge Cond: ((partsupp.ps_partkey = lineitem.l_partkey) AND (partsupp.ps_suppkey = lineitem.l_suppkey))
                                 Buffers: shared hit=1050530 read=499183 written=1733
                                 ->  Index Scan using pk_partsupp on partsupp  (cost=0.00..603091.29 rows=8000000 width=12) (actual time=0.021..7926.286 rows=7999973 loops=1)
                                       Buffers: shared hit=333857 read=100352 written=1730
                                 ->  Sort  (cost=2587589.82..2594253.98 rows=2665663 width=28) (actual time=116840.882..119673.454 rows=3272558 loops=1)
                                       Sort Key: part.p_partkey, lineitem.l_suppkey
                                       Sort Method: quicksort  Memory: 353973kB
                                       Buffers: shared hit=716673 read=398831 written=3
                                       ->  Hash Join  (cost=66623.07..2303082.77 rows=2665663 width=28) (actual time=2008.117..112675.026 rows=3272558 loops=1)
                                             Hash Cond: (lineitem.l_partkey = part.p_partkey)
                                             Buffers: shared hit=716670 read=398831 written=3
                                             ->  Seq Scan on lineitem  (cost=0.00..1680217.10 rows=60524110 width=24) (actual time=0.028..22481.062 rows=60044082 loops=1)
                                                   Buffers: shared hit=716665 read=358311 written=3
                                             ->  Hash  (cost=65522.00..65522.00 rows=88086 width=4) (actual time=2007.889..2007.889 rows=108938 loops=1)
                                                   Buckets: 16384  Batches: 1  Memory Usage: 3830kB
                                                   Buffers: shared hit=2 read=40520
                                                   ->  Seq Scan on part  (cost=0.00..65522.00 rows=88086 width=4) (actual time=0.025..1920.119 rows=108938 loops=1)
                                                         Filter: ((p_name)::text ~~ '%pink%'::text)
                                                         Rows Removed by Filter: 1891062
                                                         Buffers: shared hit=2 read=40520
                           ->  Index Scan using pk_supplier on supplier  (cost=0.00..0.28 rows=1 width=8) (actual time=0.009..0.009 rows=1 loops=3272558)
                                 Index Cond: (s_suppkey = lineitem.l_suppkey)
                                 Buffers: shared hit=9835750
                     ->  Index Scan using pk_orders on orders  (cost=0.00..1.96 rows=1 width=8) (actual time=0.027..0.028 rows=1 loops=3272558)
                           Index Cond: (o_orderkey = lineitem.l_orderkey)
                           Buffers: shared hit=12778370 read=329697 dirtied=181 written=3642
               ->  Index Scan using pk_nation on nation  (cost=0.00..0.27 rows=1 width=30) (actual time=0.006..0.006 rows=1 loops=3272558)
                     Index Cond: (n_nationkey = supplier.s_nationkey)
                     Buffers: shared hit=6545116
 Total runtime: 314261.067 ms
(43 rows)

COMMIT;
COMMIT