BEGIN;
BEGIN
EXPLAIN (ANALYZE, BUFFERS)
select
	s_name,
	count(*) as numwait
from
	supplier,
	lineitem l1,
	orders,
	nation
where
	s_suppkey = l1.l_suppkey
	and o_orderkey = l1.l_orderkey
	and o_orderstatus = 'F'
	and l1.l_receiptdate > l1.l_commitdate
	and exists (
		select
			*
		from
			lineitem l2
		where
			l2.l_orderkey = l1.l_orderkey
			and l2.l_suppkey <> l1.l_suppkey
	)
	and not exists (
		select
			*
		from
			lineitem l3
		where
			l3.l_orderkey = l1.l_orderkey
			and l3.l_suppkey <> l1.l_suppkey
			and l3.l_receiptdate > l3.l_commitdate
	)
	and s_nationkey = n_nationkey
	and n_name = 'ROMANIA'
group by
	s_name
order by
	numwait desc,
	s_name
LIMIT 100;
                                                                                                 QUERY PLAN                                                                                                 
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=1967538.06..1967538.06 rows=1 width=26) (actual time=40232.527..40232.544 rows=100 loops=1)
   Buffers: shared hit=13749509 read=935943 dirtied=1985 written=686
   ->  Sort  (cost=1967538.06..1967538.06 rows=1 width=26) (actual time=40232.524..40232.530 rows=100 loops=1)
         Sort Key: (count(*)), supplier.s_name
         Sort Method: top-N heapsort  Memory: 32kB
         Buffers: shared hit=13749509 read=935943 dirtied=1985 written=686
         ->  HashAggregate  (cost=1967538.04..1967538.05 rows=1 width=26) (actual time=40230.417..40231.437 rows=4029 loops=1)
               Group Key: supplier.s_name
               Buffers: shared hit=13749501 read=935943 dirtied=1985 written=686
               ->  Nested Loop Anti Join  (cost=2443.74..1967538.03 rows=1 width=26) (actual time=23.895..40181.608 rows=39687 loops=1)
                     Buffers: shared hit=13749501 read=935943 dirtied=1985 written=686
                     ->  Nested Loop Semi Join  (cost=2443.17..1967536.73 rows=1 width=34) (actual time=21.745..37441.765 rows=711517 loops=1)
                           Join Filter: (orders.o_orderkey = l2.l_orderkey)
                           Buffers: shared hit=10186014 read=933544 dirtied=1985 written=683
                           ->  Nested Loop  (cost=2442.61..1443604.19 rows=392083 width=38) (actual time=21.727..32672.860 rows=738055 loops=1)
                                 Buffers: shared hit=6622806 read=800370 dirtied=1985 written=552
                                 ->  Hash Join  (cost=2442.17..1018747.90 rows=806993 width=34) (actual time=21.572..24465.304 rows=1527608 loops=1)
                                       Hash Cond: (l1.l_suppkey = supplier.s_suppkey)
                                       Buffers: shared hit=613948 read=690433 dirtied=1985 written=475
                                       ->  Index Scan using lineitem_l_orderkey_idx_part1 on lineitem l1  (cost=0.56..932580.81 rows=20174814 width=8) (actual time=0.087..17964.679 rows=37927367 loops=1)
                                             Buffers: shared hit=612103 read=690420 dirtied=1985 written=475
                                       ->  Hash  (cost=2391.61..2391.61 rows=4000 width=30) (actual time=21.435..21.435 rows=4029 loops=1)
                                             Buckets: 4096  Batches: 1  Memory Usage: 284kB
                                             Buffers: shared hit=1842 read=13
                                             ->  Nested Loop  (cost=79.29..2391.61 rows=4000 width=30) (actual time=1.162..20.364 rows=4029 loops=1)
                                                   Buffers: shared hit=1842 read=13
                                                   ->  Seq Scan on nation  (cost=0.00..1.31 rows=1 width=4) (actual time=0.009..0.014 rows=1 loops=1)
                                                         Filter: (n_name = 'ROMANIA'::bpchar)
                                                         Rows Removed by Filter: 24
                                                         Buffers: shared hit=1
                                                   ->  Bitmap Heap Scan on supplier  (cost=79.29..2350.29 rows=4000 width=34) (actual time=1.147..19.565 rows=4029 loops=1)
                                                         Recheck Cond: (s_nationkey = nation.n_nationkey)
                                                         Heap Blocks: exact=1841
                                                         Buffers: shared hit=1841 read=13
                                                         ->  Bitmap Index Scan on supplier_s_nationkey_s_suppkey_idx  (cost=0.00..78.29 rows=4000 width=0) (actual time=0.868..0.868 rows=4029 loops=1)
                                                               Index Cond: (s_nationkey = nation.n_nationkey)
                                                               Buffers: shared read=13
                                 ->  Index Scan using orders_o_orderkey_o_orderdate_idx on orders  (cost=0.43..0.52 rows=1 width=4) (actual time=0.005..0.005 rows=0 loops=1527608)
                                       Index Cond: (o_orderkey = l1.l_orderkey)
                                       Filter: (o_orderstatus = 'F'::bpchar)
                                       Rows Removed by Filter: 1
                                       Buffers: shared hit=6008858 read=109937 written=77
                           ->  Index Scan using lineitem_l_orderkey_idx on lineitem l2  (cost=0.56..1.15 rows=15 width=8) (actual time=0.006..0.006 rows=1 loops=738055)
                                 Index Cond: (l_orderkey = l1.l_orderkey)
                                 Filter: (l_suppkey <> l1.l_suppkey)
                                 Rows Removed by Filter: 0
                                 Buffers: shared hit=3563208 read=133174 written=131
                     ->  Index Scan using lineitem_l_orderkey_idx_part1 on lineitem l3  (cost=0.56..0.91 rows=5 width=8) (actual time=0.003..0.003 rows=1 loops=711517)
                           Index Cond: (l_orderkey = l1.l_orderkey)
                           Filter: (l_suppkey <> l1.l_suppkey)
                           Rows Removed by Filter: 0
                           Buffers: shared hit=3563487 read=2399 written=3
 Planning time: 9.431 ms
 Execution time: 40232.879 ms
(54 rows)

COMMIT;
COMMIT