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 'gainsboro%'
			and ps_availqty > (
				select
					0.5 * sum(l_quantity)
				from
					lineitem
				where
					l_partkey = ps_partkey
					and l_suppkey = ps_suppkey
					and l_shipdate >= '1993-01-01'
					and l_shipdate < cast(date '1993-01-01' + interval '1 year' as date)
			)
	)
	and s_nationkey = n_nationkey
	and n_name = 'CANADA'
order by
	s_name;
                                                                                               QUERY PLAN                                                                                                
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=11590858.57..11590861.23 rows=1064 width=51) (actual time=17227.829..17228.027 rows=1778 loops=1)
   Sort Key: supplier.s_name
   Sort Method: quicksort  Memory: 256kB
   Buffers: shared hit=2705377 read=387115 dirtied=4500
   ->  Hash Semi Join  (cost=11588461.94..11590805.08 rows=1064 width=51) (actual time=17178.338..17201.756 rows=1778 loops=1)
         Hash Cond: (supplier.s_suppkey = partsupp.ps_suppkey)
         Buffers: shared hit=2705372 read=387115 dirtied=4500
         ->  Nested Loop  (cost=79.26..2391.58 rows=4000 width=55) (actual time=1.724..20.200 rows=4054 loops=1)
               Buffers: shared hit=1854 read=14
               ->  Seq Scan on nation  (cost=0.00..1.31 rows=1 width=4) (actual time=0.013..0.028 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=1.703..19.129 rows=4054 loops=1)
                     Recheck Cond: (s_nationkey = nation.n_nationkey)
                     Buffers: shared hit=1853 read=14
                     ->  Bitmap Index Scan on supplier_s_nationkey_s_suppkey_idx  (cost=0.00..78.26 rows=4000 width=0) (actual time=1.315..1.315 rows=4054 loops=1)
                           Index Cond: (s_nationkey = nation.n_nationkey)
                           Buffers: shared read=14
         ->  Hash  (cost=11588050.17..11588050.17 rows=26601 width=4) (actual time=17176.553..17176.553 rows=44465 loops=1)
               Buckets: 4096  Batches: 1  Memory Usage: 1564kB
               Buffers: shared hit=2703518 read=387101 dirtied=4500
               ->  HashAggregate  (cost=11587518.15..11587784.16 rows=26601 width=4) (actual time=17142.517..17166.136 rows=44465 loops=1)
                     Buffers: shared hit=2703518 read=387101 dirtied=4500
                     ->  Nested Loop  (cost=0.00..11587451.64 rows=26601 width=4) (actual time=1.185..17019.673 rows=58659 loops=1)
                           Buffers: shared hit=2703518 read=387101 dirtied=4500
                           ->  Seq Scan on part  (cost=0.00..65522.00 rows=20020 width=4) (actual time=0.061..1238.973 rows=21606 loops=1)
                                 Filter: ((p_name)::text ~~ 'gainsboro%'::text)
                                 Rows Removed by Filter: 1978394
                                 Buffers: shared hit=19995 read=20527
                           ->  Index Scan using pk_partsupp on partsupp  (cost=0.00..575.51 rows=1 width=8) (actual time=0.561..0.727 rows=3 loops=21606)
                                 Index Cond: (ps_partkey = part.p_partkey)
                                 Filter: ((ps_availqty)::double precision > (SubPlan 1))
                                 Rows Removed by Filter: 1
                                 Buffers: shared hit=2683523 read=366574 dirtied=4500
                                 SubPlan 1
                                   ->  Aggregate  (cost=140.92..140.93 rows=1 width=4) (actual time=0.170..0.170 rows=1 loops=86424)
                                         Buffers: shared hit=2611808 read=349006 dirtied=4500
                                         ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=0.00..140.92 rows=1 width=4) (actual time=0.106..0.168 rows=1 loops=86424)
                                               Index Cond: (l_partkey = partsupp.ps_partkey)
                                               Filter: ((l_shipdate >= '1993-01-01'::date) AND (l_shipdate < '1994-01-01'::date) AND (l_suppkey = partsupp.ps_suppkey))
                                               Rows Removed by Filter: 29
                                               Buffers: shared hit=2611808 read=349006 dirtied=4500
 Total runtime: 17230.644 ms
(44 rows)

COMMIT;
COMMIT