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=1957424.25..1957424.25 rows=1 width=26) (actual time=51154.904..51154.926 rows=100 loops=1)
   Buffers: shared hit=13526477 read=816867 dirtied=861 written=2699
   ->  Sort  (cost=1957424.25..1957424.25 rows=1 width=26) (actual time=51154.901..51154.906 rows=100 loops=1)
         Sort Key: (count(*)), supplier.s_name
         Sort Method: top-N heapsort  Memory: 32kB
         Buffers: shared hit=13526477 read=816867 dirtied=861 written=2699
         ->  HashAggregate  (cost=1957424.23..1957424.24 rows=1 width=26) (actual time=51152.137..51153.644 rows=3934 loops=1)
               Group Key: supplier.s_name
               Buffers: shared hit=13526469 read=816867 dirtied=861 written=2699
               ->  Nested Loop Anti Join  (cost=2443.74..1957424.22 rows=1 width=26) (actual time=18.622..51058.772 rows=39161 loops=1)
                     Buffers: shared hit=13526469 read=816867 dirtied=861 written=2699
                     ->  Nested Loop Semi Join  (cost=2443.17..1957422.91 rows=1 width=34) (actual time=18.468..48212.634 rows=694976 loops=1)
                           Join Filter: (orders.o_orderkey = l2.l_orderkey)
                           Buffers: shared hit=10045296 read=814977 dirtied=861 written=2694
                           ->  Nested Loop  (cost=2442.61..1435322.68 rows=390759 width=38) (actual time=18.385..42267.827 rows=721282 loops=1)
                                 Buffers: shared hit=6597032 read=650910 dirtied=857 written=1849
                                 ->  Hash Join  (cost=2442.17..1013024.57 rows=802210 width=34) (actual time=18.345..32388.609 rows=1491527 loops=1)
                                       Hash Cond: (l1.l_suppkey = supplier.s_suppkey)
                                       Buffers: shared hit=726980 read=546670 dirtied=605 written=1414
                                       ->  Index Scan using lineitem_l_orderkey_idx_part1 on lineitem l1  (cost=0.56..927353.63 rows=20055261 width=8) (actual time=0.089..20982.518 rows=37966418 loops=1)
                                             Buffers: shared hit=725131 read=546658 dirtied=605 written=1414
                                       ->  Hash  (cost=2391.61..2391.61 rows=4000 width=30) (actual time=18.167..18.167 rows=3934 loops=1)
                                             Buckets: 4096  Batches: 1  Memory Usage: 278kB
                                             Buffers: shared hit=1846 read=12
                                             ->  Nested Loop  (cost=79.29..2391.61 rows=4000 width=30) (actual time=1.439..16.858 rows=3934 loops=1)
                                                   Buffers: shared hit=1846 read=12
                                                   ->  Seq Scan on nation  (cost=0.00..1.31 rows=1 width=4) (actual time=0.013..0.025 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=1.419..16.018 rows=3934 loops=1)
                                                         Recheck Cond: (s_nationkey = nation.n_nationkey)
                                                         Heap Blocks: exact=1845
                                                         Buffers: shared hit=1845 read=12
                                                         ->  Bitmap Index Scan on supplier_s_nationkey_s_suppkey_idx  (cost=0.00..78.29 rows=4000 width=0) (actual time=1.109..1.109 rows=3934 loops=1)
                                                               Index Cond: (s_nationkey = nation.n_nationkey)
                                                               Buffers: shared read=12
                                 ->  Index Scan using orders_o_orderkey_o_orderdate_idx on orders  (cost=0.43..0.52 rows=1 width=4) (actual time=0.006..0.006 rows=0 loops=1491527)
                                       Index Cond: (o_orderkey = l1.l_orderkey)
                                       Filter: (o_orderstatus = 'F'::bpchar)
                                       Rows Removed by Filter: 1
                                       Buffers: shared hit=5870052 read=104240 dirtied=252 written=435
                           ->  Index Scan using lineitem_l_orderkey_idx on lineitem l2  (cost=0.56..1.15 rows=15 width=8) (actual time=0.007..0.007 rows=1 loops=721282)
                                 Index Cond: (l_orderkey = l1.l_orderkey)
                                 Filter: (l_suppkey <> l1.l_suppkey)
                                 Rows Removed by Filter: 0
                                 Buffers: shared hit=3448264 read=164067 dirtied=4 written=845
                     ->  Index Scan using lineitem_l_orderkey_idx_part1 on lineitem l3  (cost=0.56..0.91 rows=5 width=8) (actual time=0.004..0.004 rows=1 loops=694976)
                           Index Cond: (l_orderkey = l1.l_orderkey)
                           Filter: (l_suppkey <> l1.l_suppkey)
                           Rows Removed by Filter: 0
                           Buffers: shared hit=3481173 read=1890 written=5
 Planning time: 11.936 ms
 Execution time: 51155.453 ms
(54 rows)

COMMIT;
COMMIT