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 '%antique%'
	) as profit
group by
	nation,
	o_year
order by
	nation,
	o_year desc;
                                                                                  QUERY PLAN                                                                                   
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 GroupAggregate  (cost=3487996.27..3488000.92 rows=133 width=46) (actual time=245592.182..248820.503 rows=175 loops=1)
   Buffers: shared hit=30200671 read=590300 dirtied=33 written=3041
   ->  Sort  (cost=3487996.27..3487996.60 rows=133 width=46) (actual time=245574.391..246476.609 rows=3245219 loops=1)
         Sort Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
         Sort Method: quicksort  Memory: 554663kB
         Buffers: shared hit=30200671 read=590300 dirtied=33 written=3041
         ->  Nested Loop  (cost=2819595.15..3487991.58 rows=133 width=46) (actual time=112746.449..225416.123 rows=3245219 loops=1)
               Buffers: shared hit=30200663 read=590300 dirtied=33 written=3041
               ->  Nested Loop  (cost=2819595.15..3487953.64 rows=133 width=24) (actual time=112746.378..207877.233 rows=3245219 loops=1)
                     Buffers: shared hit=23710225 read=590300 dirtied=33 written=3041
                     ->  Nested Loop  (cost=2819595.15..3487691.47 rows=133 width=24) (actual time=112746.260..145177.628 rows=3245219 loops=1)
                           Buffers: shared hit=10953401 read=348595 written=2856
                           ->  Merge Join  (cost=2819595.15..3487652.74 rows=133 width=28) (actual time=112746.210..125280.253 rows=3245219 loops=1)
                                 Merge Cond: ((partsupp.ps_partkey = lineitem.l_partkey) AND (partsupp.ps_suppkey = lineitem.l_suppkey))
                                 Buffers: shared hit=1200049 read=348595 written=2856
                                 ->  Index Scan using pk_partsupp on partsupp  (cost=0.00..603091.33 rows=8000000 width=12) (actual time=0.022..5679.045 rows=7999757 loops=1)
                                       Buffers: shared hit=333105 read=101093 written=514
                                 ->  Sort  (cost=2819595.03..2827917.06 rows=3328813 width=28) (actual time=112745.914..115245.773 rows=3245219 loops=1)
                                       Sort Key: part.p_partkey, lineitem.l_suppkey
                                       Sort Method: quicksort  Memory: 351837kB
                                       Buffers: shared hit=866944 read=247502 written=2342
                                       ->  Hash Join  (cost=66898.35..2458975.13 rows=3328813 width=28) (actual time=2381.358..108480.387 rows=3245219 loops=1)
                                             Hash Cond: (lineitem.l_partkey = part.p_partkey)
                                             Buffers: shared hit=866941 read=247502 written=2342
                                             ->  Seq Scan on lineitem  (cost=0.00..1678563.01 rows=60464501 width=24) (actual time=0.027..20322.872 rows=60044664 loops=1)
                                                   Buffers: shared hit=866936 read=206982 written=2
                                             ->  Hash  (cost=65522.00..65522.00 rows=110108 width=4) (actual time=2381.068..2381.068 rows=108175 loops=1)
                                                   Buckets: 16384  Batches: 1  Memory Usage: 3804kB
                                                   Buffers: shared hit=2 read=40520 written=2340
                                                   ->  Seq Scan on part  (cost=0.00..65522.00 rows=110108 width=4) (actual time=0.101..2291.537 rows=108175 loops=1)
                                                         Filter: ((p_name)::text ~~ '%antique%'::text)
                                                         Rows Removed by Filter: 1891825
                                                         Buffers: shared hit=2 read=40520 written=2340
                           ->  Index Scan using pk_supplier on supplier  (cost=0.00..0.28 rows=1 width=8) (actual time=0.005..0.005 rows=1 loops=3245219)
                                 Index Cond: (s_suppkey = lineitem.l_suppkey)
                                 Buffers: shared hit=9753352
                     ->  Index Only Scan using orders_o_orderkey_o_orderdate_idx on orders  (cost=0.00..1.96 rows=1 width=8) (actual time=0.018..0.018 rows=1 loops=3245219)
                           Index Cond: (o_orderkey = lineitem.l_orderkey)
                           Heap Fetches: 3245219
                           Buffers: shared hit=12756824 read=241705 dirtied=33 written=185
               ->  Index Scan using pk_nation on nation  (cost=0.00..0.27 rows=1 width=30) (actual time=0.003..0.003 rows=1 loops=3245219)
                     Index Cond: (n_nationkey = supplier.s_nationkey)
                     Buffers: shared hit=6490438
 Total runtime: 248925.088 ms
(44 rows)

COMMIT;
COMMIT