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 '%mint%'
	) as profit
group by
	nation,
	o_year
order by
	nation,
	o_year desc;
                                                                                   QUERY PLAN                                                                                   
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 GroupAggregate  (cost=3622659.72..3622665.04 rows=152 width=46) (actual time=699659.267..703088.284 rows=175 loops=1)
   Buffers: shared hit=30222713 read=714277 dirtied=20 written=2662
   ->  Sort  (cost=3622659.72..3622660.10 rows=152 width=46) (actual time=699646.159..700586.956 rows=3261582 loops=1)
         Sort Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
         Sort Method: quicksort  Memory: 556964kB
         Buffers: shared hit=30222713 read=714277 dirtied=20 written=2662
         ->  Nested Loop  (cost=2950634.36..3622654.21 rows=152 width=46) (actual time=197589.706..678450.013 rows=3261582 loops=1)
               Buffers: shared hit=30222705 read=714277 dirtied=20 written=2662
               ->  Nested Loop  (cost=2950634.36..3622610.86 rows=152 width=24) (actual time=197589.643..560118.730 rows=3261582 loops=1)
                     Buffers: shared hit=23699541 read=714277 dirtied=20 written=2662
                     ->  Nested Loop  (cost=2950634.36..3622312.24 rows=152 width=24) (actual time=197589.525..338307.213 rows=3261582 loops=1)
                           Buffers: shared hit=10724215 read=625348 written=1205
                           ->  Merge Join  (cost=2950634.36..3622267.98 rows=152 width=28) (actual time=197589.497..219013.113 rows=3261582 loops=1)
                                 Merge Cond: ((partsupp.ps_partkey = lineitem.l_partkey) AND (partsupp.ps_suppkey = lineitem.l_suppkey))
                                 Buffers: shared hit=921187 read=625348 written=1205
                                 ->  Index Scan using pk_partsupp on partsupp  (cost=0.00..603091.29 rows=8000000 width=12) (actual time=0.008..13037.214 rows=7999969 loops=1)
                                       Buffers: shared hit=389267 read=44942 written=1201
                                 ->  Sort  (cost=2950634.33..2960147.97 rows=3805453 width=28) (actual time=197589.366..200618.080 rows=3261582 loops=1)
                                       Sort Key: part.p_partkey, lineitem.l_suppkey
                                       Sort Method: quicksort  Memory: 353116kB
                                       Buffers: shared hit=531920 read=580406 written=4
                                       ->  Hash Join  (cost=67098.55..2534705.23 rows=3805453 width=28) (actual time=3599.732..193445.849 rows=3261582 loops=1)
                                             Hash Cond: (lineitem.l_partkey = part.p_partkey)
                                             Buffers: shared hit=531917 read=580406 written=4
                                             ->  Seq Scan on lineitem  (cost=0.00..1675244.29 rows=60344629 width=24) (actual time=0.029..69548.385 rows=60045826 loops=1)
                                                   Buffers: shared hit=511055 read=560743 written=4
                                             ->  Hash  (cost=65522.00..65522.00 rows=126124 width=4) (actual time=3599.480..3599.480 rows=108669 loops=1)
                                                   Buckets: 16384  Batches: 1  Memory Usage: 3821kB
                                                   Buffers: shared hit=20859 read=19663
                                                   ->  Seq Scan on part  (cost=0.00..65522.00 rows=126124 width=4) (actual time=0.026..3515.846 rows=108669 loops=1)
                                                         Filter: ((p_name)::text ~~ '%mint%'::text)
                                                         Rows Removed by Filter: 1891331
                                                         Buffers: shared hit=20859 read=19663
                           ->  Index Scan using pk_supplier on supplier  (cost=0.00..0.28 rows=1 width=8) (actual time=0.035..0.035 rows=1 loops=3261582)
                                 Index Cond: (s_suppkey = lineitem.l_suppkey)
                                 Buffers: shared hit=9803028
                     ->  Index Scan using pk_orders on orders  (cost=0.00..1.95 rows=1 width=8) (actual time=0.066..0.067 rows=1 loops=3261582)
                           Index Cond: (o_orderkey = lineitem.l_orderkey)
                           Buffers: shared hit=12975326 read=88929 dirtied=20 written=1457
               ->  Index Scan using pk_nation on nation  (cost=0.00..0.27 rows=1 width=30) (actual time=0.033..0.033 rows=1 loops=3261582)
                     Index Cond: (n_nationkey = supplier.s_nationkey)
                     Buffers: shared hit=6523164
 Total runtime: 703223.885 ms
(43 rows)

COMMIT;
COMMIT