BEGIN;
BEGIN
EXPLAIN (ANALYZE, BUFFERS)
select
	s_name,
	s_address
from
	supplier,
	nation
where
	s_suppkey in (
		select
			distinct (ps_suppkey)
		from
			partsupp,
			part
		where
			ps_partkey=p_partkey
			and p_name like 'forest%'
			and ps_availqty > (
				select
					0.5 * sum(l_quantity)
				from
					lineitem
				where
					l_partkey = ps_partkey
					and l_suppkey = ps_suppkey
					and l_shipdate >= '1997-01-01'
					and l_shipdate < cast(date '1997-01-01' + interval '1 year' as date)
			)
	)
	and s_nationkey = n_nationkey
	and n_name = 'RUSSIA'
order by
	s_name;
                                                                                            QUERY PLAN                                                                                             
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=12089117.23..12089120.16 rows=1174 width=51) (actual time=10308.636..10308.734 rows=1820 loops=1)
   Sort Key: supplier.s_name
   Sort Method: quicksort  Memory: 260kB
   Buffers: shared hit=2731935 read=357589 dirtied=3564 written=476
   ->  Hash Join  (cost=12088348.31..12089057.37 rows=1174 width=51) (actual time=10273.722..10306.404 rows=1820 loops=1)
         Hash Cond: (partsupp.ps_suppkey = supplier.s_suppkey)
         Buffers: shared hit=2731930 read=357589 dirtied=3564 written=476
         ->  HashAggregate  (cost=12085906.70..12086200.31 rows=29361 width=4) (actual time=10257.027..10279.431 rows=44384 loops=1)
               Group Key: partsupp.ps_suppkey
               Buffers: shared hit=2730081 read=357576 dirtied=3564 written=476
               ->  Nested Loop  (cost=0.86..12085833.30 rows=29361 width=4) (actual time=0.573..10182.925 rows=58649 loops=1)
                     Buffers: shared hit=2730081 read=357576 dirtied=3564 written=476
                     ->  Index Scan using pk_part on part  (cost=0.43..97473.43 rows=22021 width=4) (actual time=0.034..1172.455 rows=21551 loops=1)
                           Filter: ((p_name)::text ~~ 'forest%'::text)
                           Rows Removed by Filter: 1978449
                           Buffers: shared hit=2423 read=44318 written=58
                     ->  Index Scan using pk_partsupp on partsupp  (cost=0.43..544.40 rows=1 width=8) (actual time=0.352..0.416 rows=3 loops=21551)
                           Index Cond: (ps_partkey = part.p_partkey)
                           Filter: ((ps_availqty)::double precision > (SubPlan 1))
                           Rows Removed by Filter: 1
                           Buffers: shared hit=2727658 read=313258 dirtied=3564 written=418
                           SubPlan 1
                             ->  Aggregate  (cost=133.37..133.38 rows=1 width=4) (actual time=0.095..0.095 rows=1 loops=86204)
                                   Buffers: shared hit=2673766 read=278078 dirtied=3564 written=371
                                   ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=0.56..133.36 rows=1 width=4) (actual time=0.059..0.094 rows=1 loops=86204)
                                         Index Cond: (l_partkey = partsupp.ps_partkey)
                                         Filter: ((l_shipdate >= '1997-01-01'::date) AND (l_shipdate < '1998-01-01'::date) AND (l_suppkey = partsupp.ps_suppkey))
                                         Rows Removed by Filter: 29
                                         Buffers: shared hit=2673766 read=278078 dirtied=3564 written=371
         ->  Hash  (cost=2391.61..2391.61 rows=4000 width=55) (actual time=16.609..16.609 rows=4021 loops=1)
               Buckets: 4096  Batches: 1  Memory Usage: 384kB
               Buffers: shared hit=1849 read=13
               ->  Nested Loop  (cost=79.29..2391.61 rows=4000 width=55) (actual time=1.263..15.121 rows=4021 loops=1)
                     Buffers: shared hit=1849 read=13
                     ->  Seq Scan on nation  (cost=0.00..1.31 rows=1 width=4) (actual time=0.010..0.014 rows=1 loops=1)
                           Filter: (n_name = 'RUSSIA'::bpchar)
                           Rows Removed by Filter: 24
                           Buffers: shared hit=1
                     ->  Bitmap Heap Scan on supplier  (cost=79.29..2350.29 rows=4000 width=59) (actual time=1.244..14.212 rows=4021 loops=1)
                           Recheck Cond: (s_nationkey = nation.n_nationkey)
                           Heap Blocks: exact=1848
                           Buffers: shared hit=1848 read=13
                           ->  Bitmap Index Scan on supplier_s_nationkey_s_suppkey_idx  (cost=0.00..78.29 rows=4000 width=0) (actual time=0.934..0.934 rows=4021 loops=1)
                                 Index Cond: (s_nationkey = nation.n_nationkey)
                                 Buffers: shared read=13
 Planning time: 5.199 ms
 Execution time: 10309.876 ms
(47 rows)

COMMIT;
COMMIT