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 'wheat%'
			and ps_availqty > (
				select
					0.5 * sum(l_quantity)
				from
					lineitem
				where
					l_partkey = ps_partkey
					and l_suppkey = ps_suppkey
					and l_shipdate >= '1994-01-01'
					and l_shipdate < cast(date '1994-01-01' + interval '1 year' as date)
			)
	)
	and s_nationkey = n_nationkey
	and n_name = 'JAPAN'
order by
	s_name;
                                                                                                  QUERY PLAN                                                                                                   
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=12740177.87..12740180.80 rows=1169 width=51) (actual time=14327.394..14327.656 rows=1806 loops=1)
   Sort Key: supplier.s_name
   Sort Method: quicksort  Memory: 258kB
   Buffers: shared hit=2730994 read=349553 dirtied=621 written=18
   ->  Nested Loop  (cost=12735712.48..12740118.31 rows=1169 width=51) (actual time=14073.541..14310.279 rows=1806 loops=1)
         Join Filter: (supplier.s_nationkey = nation.n_nationkey)
         Rows Removed by Join Filter: 42625
         Buffers: shared hit=2730989 read=349553 dirtied=621 written=18
         ->  Seq Scan on nation  (cost=0.00..1.31 rows=1 width=4) (actual time=0.016..0.026 rows=1 loops=1)
               Filter: (n_name = 'JAPAN'::bpchar)
               Rows Removed by Filter: 24
               Buffers: shared hit=1
         ->  Hash Semi Join  (cost=12735712.48..12739751.56 rows=29235 width=55) (actual time=14073.409..14301.959 rows=44431 loops=1)
               Hash Cond: (supplier.s_suppkey = partsupp.ps_suppkey)
               Buffers: shared hit=2730988 read=349553 dirtied=621 written=18
               ->  Seq Scan on supplier  (cost=0.00..3179.00 rows=100000 width=59) (actual time=0.019..48.612 rows=100000 loops=1)
                     Buffers: shared hit=2179
               ->  Hash  (cost=12735347.04..12735347.04 rows=29235 width=4) (actual time=14073.339..14073.339 rows=44431 loops=1)
                     Buckets: 4096  Batches: 1  Memory Usage: 1563kB
                     Buffers: shared hit=2728809 read=349553 dirtied=621 written=18
                     ->  HashAggregate  (cost=12734762.34..12735054.69 rows=29235 width=4) (actual time=14025.669..14057.156 rows=44431 loops=1)
                           Buffers: shared hit=2728809 read=349553 dirtied=621 written=18
                           ->  Nested Loop  (cost=0.00..12734689.26 rows=29235 width=4) (actual time=1.058..13910.465 rows=58685 loops=1)
                                 Buffers: shared hit=2728809 read=349553 dirtied=621 written=18
                                 ->  Seq Scan on part  (cost=0.00..65522.00 rows=22021 width=4) (actual time=0.095..1235.975 rows=21576 loops=1)
                                       Filter: ((p_name)::text ~~ 'wheat%'::text)
                                       Rows Removed by Filter: 1978424
                                       Buffers: shared hit=922 read=39600 written=5
                                 ->  Index Scan using pk_partsupp on partsupp  (cost=0.00..575.31 rows=1 width=8) (actual time=0.450..0.585 rows=3 loops=21576)
                                       Index Cond: (ps_partkey = part.p_partkey)
                                       Filter: ((ps_availqty)::double precision > (SubPlan 1))
                                       Rows Removed by Filter: 1
                                       Buffers: shared hit=2727887 read=309953 dirtied=621 written=13
                                       SubPlan 1
                                         ->  Aggregate  (cost=140.92..140.94 rows=1 width=4) (actual time=0.134..0.134 rows=1 loops=86304)
                                               Buffers: shared hit=2672245 read=276393 dirtied=621 written=11
                                               ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=0.00..140.92 rows=1 width=4) (actual time=0.083..0.131 rows=1 loops=86304)
                                                     Index Cond: (l_partkey = partsupp.ps_partkey)
                                                     Filter: ((l_shipdate >= '1994-01-01'::date) AND (l_shipdate < '1995-01-01'::date) AND (l_suppkey = partsupp.ps_suppkey))
                                                     Rows Removed by Filter: 29
                                                     Buffers: shared hit=2672245 read=276393 dirtied=621 written=11
 Total runtime: 14330.398 ms
(42 rows)

COMMIT;
COMMIT