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 = 'ALGERIA'
group by
	s_name
order by
	numwait desc,
	s_name
LIMIT 100;
                                                                                                 QUERY PLAN                                                                                                 
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=1961635.00..1961635.01 rows=1 width=26) (actual time=38455.836..38455.844 rows=100 loops=1)
   Buffers: shared hit=12952599 read=1370688
   ->  Sort  (cost=1961635.00..1961635.01 rows=1 width=26) (actual time=38455.833..38455.833 rows=100 loops=1)
         Sort Key: (count(*)), supplier.s_name
         Sort Method: top-N heapsort  Memory: 32kB
         Buffers: shared hit=12952599 read=1370688
         ->  HashAggregate  (cost=1961634.98..1961634.99 rows=1 width=26) (actual time=38453.847..38454.815 rows=3934 loops=1)
               Group Key: supplier.s_name
               Buffers: shared hit=12952591 read=1370688
               ->  Nested Loop Anti Join  (cost=2443.74..1961634.98 rows=1 width=26) (actual time=27.399..38403.636 rows=39112 loops=1)
                     Buffers: shared hit=12952591 read=1370688
                     ->  Nested Loop Semi Join  (cost=2443.17..1961633.67 rows=1 width=34) (actual time=27.308..36111.432 rows=694246 loops=1)
                           Join Filter: (orders.o_orderkey = l2.l_orderkey)
                           Buffers: shared hit=9476610 read=1367271
                           ->  Nested Loop  (cost=2442.61..1437305.55 rows=392410 width=38) (actual time=27.173..31684.364 rows=720539 loops=1)
                                 Buffers: shared hit=6033960 read=1201326
                                 ->  Hash Join  (cost=2442.17..1014488.31 rows=803171 width=34) (actual time=27.142..24884.172 rows=1490036 loops=1)
                                       Hash Cond: (l1.l_suppkey = supplier.s_suppkey)
                                       Buffers: shared hit=122437 read=1144563
                                       ->  Index Scan using lineitem_l_orderkey_idx_part1 on lineitem l1  (cost=0.56..928658.27 rows=20095126 width=8) (actual time=0.096..18427.018 rows=37929015 loops=1)
                                             Buffers: shared hit=120873 read=1144266
                                       ->  Hash  (cost=2391.61..2391.61 rows=4000 width=30) (actual time=26.983..26.983 rows=3934 loops=1)
                                             Buckets: 4096  Batches: 1  Memory Usage: 278kB
                                             Buffers: shared hit=1561 read=297
                                             ->  Nested Loop  (cost=79.29..2391.61 rows=4000 width=30) (actual time=1.189..25.816 rows=3934 loops=1)
                                                   Buffers: shared hit=1561 read=297
                                                   ->  Seq Scan on nation  (cost=0.00..1.31 rows=1 width=4) (actual time=0.009..0.023 rows=1 loops=1)
                                                         Filter: (n_name = 'ALGERIA'::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=1.174..24.824 rows=3934 loops=1)
                                                         Recheck Cond: (s_nationkey = nation.n_nationkey)
                                                         Heap Blocks: exact=1845
                                                         Buffers: shared hit=1560 read=297
                                                         ->  Bitmap Index Scan on supplier_s_nationkey_s_suppkey_idx  (cost=0.00..78.29 rows=4000 width=0) (actual time=0.865..0.865 rows=3934 loops=1)
                                                               Index Cond: (s_nationkey = nation.n_nationkey)
                                                               Buffers: shared hit=2 read=10
                                 ->  Index Scan using orders_o_orderkey_o_orderdate_idx on orders  (cost=0.43..0.52 rows=1 width=4) (actual time=0.004..0.004 rows=0 loops=1490036)
                                       Index Cond: (o_orderkey = l1.l_orderkey)
                                       Filter: (o_orderstatus = 'F'::bpchar)
                                       Rows Removed by Filter: 1
                                       Buffers: shared hit=5911523 read=56763
                           ->  Index Scan using lineitem_l_orderkey_idx on lineitem l2  (cost=0.56..1.15 rows=15 width=8) (actual time=0.005..0.005 rows=1 loops=720539)
                                 Index Cond: (l_orderkey = l1.l_orderkey)
                                 Filter: (l_suppkey <> l1.l_suppkey)
                                 Rows Removed by Filter: 0
                                 Buffers: shared hit=3442650 read=165945
                     ->  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=694246)
                           Index Cond: (l_orderkey = l1.l_orderkey)
                           Filter: (l_suppkey <> l1.l_suppkey)
                           Rows Removed by Filter: 0
                           Buffers: shared hit=3475981 read=3417
 Planning time: 10.787 ms
 Execution time: 38456.162 ms
(54 rows)

COMMIT;
COMMIT