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 'royal%'
			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 = 'CANADA'
order by
	s_name;
                                                                                               QUERY PLAN                                                                                                
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=11590901.82..11590904.48 rows=1067 width=51) (actual time=16918.823..16919.007 rows=1810 loops=1)
   Sort Key: supplier.s_name
   Sort Method: quicksort  Memory: 259kB
   Buffers: shared hit=2736628 read=375610 dirtied=4376 written=238
   ->  Hash Semi Join  (cost=11588503.26..11590848.15 rows=1067 width=51) (actual time=16865.510..16888.202 rows=1810 loops=1)
         Hash Cond: (supplier.s_suppkey = partsupp.ps_suppkey)
         Buffers: shared hit=2736623 read=375610 dirtied=4376 written=238
         ->  Nested Loop  (cost=79.26..2391.58 rows=4000 width=55) (actual time=5.339..22.391 rows=4054 loops=1)
               Buffers: shared hit=1855 read=13
               ->  Seq Scan on nation  (cost=0.00..1.31 rows=1 width=4) (actual time=0.015..0.030 rows=1 loops=1)
                     Filter: (n_name = 'CANADA'::bpchar)
                     Rows Removed by Filter: 24
                     Buffers: shared hit=1
               ->  Bitmap Heap Scan on supplier  (cost=79.26..2350.26 rows=4000 width=59) (actual time=5.318..20.956 rows=4054 loops=1)
                     Recheck Cond: (s_nationkey = nation.n_nationkey)
                     Buffers: shared hit=1854 read=13
                     ->  Bitmap Index Scan on supplier_s_nationkey_s_suppkey_idx  (cost=0.00..78.26 rows=4000 width=0) (actual time=4.897..4.897 rows=4054 loops=1)
                           Index Cond: (s_nationkey = nation.n_nationkey)
                           Buffers: shared hit=1 read=13
         ->  Hash  (cost=11588090.43..11588090.43 rows=26686 width=4) (actual time=16860.106..16860.106 rows=44480 loops=1)
               Buckets: 4096  Batches: 1  Memory Usage: 1564kB
               Buffers: shared hit=2734768 read=375597 dirtied=4376 written=238
               ->  HashAggregate  (cost=11587556.71..11587823.57 rows=26686 width=4) (actual time=16818.248..16843.272 rows=44480 loops=1)
                     Buffers: shared hit=2734768 read=375597 dirtied=4376 written=238
                     ->  Nested Loop  (cost=0.00..11587489.99 rows=26686 width=4) (actual time=1.102..16689.304 rows=58828 loops=1)
                           Buffers: shared hit=2734768 read=375597 dirtied=4376 written=238
                           ->  Seq Scan on part  (cost=0.00..65522.00 rows=20020 width=4) (actual time=0.032..1324.286 rows=21695 loops=1)
                                 Filter: ((p_name)::text ~~ 'royal%'::text)
                                 Rows Removed by Filter: 1978305
                                 Buffers: shared hit=9393 read=31129 written=20
                           ->  Index Scan using pk_partsupp on partsupp  (cost=0.00..575.51 rows=1 width=8) (actual time=0.542..0.705 rows=3 loops=21695)
                                 Index Cond: (ps_partkey = part.p_partkey)
                                 Filter: ((ps_availqty)::double precision > (SubPlan 1))
                                 Rows Removed by Filter: 1
                                 Buffers: shared hit=2725375 read=344468 dirtied=4376 written=218
                                 SubPlan 1
                                   ->  Aggregate  (cost=140.92..140.94 rows=1 width=4) (actual time=0.165..0.165 rows=1 loops=86780)
                                         Buffers: shared hit=2652998 read=327306 dirtied=4376 written=198
                                         ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=0.00..140.92 rows=1 width=4) (actual time=0.103..0.162 rows=1 loops=86780)
                                               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=2652998 read=327306 dirtied=4376 written=198
 Total runtime: 16921.208 ms
(44 rows)

COMMIT;
COMMIT