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=1975875.27..1975875.28 rows=1 width=26) (actual time=40027.697..40027.713 rows=100 loops=1)
   Buffers: shared hit=13764655 read=574751 written=7565
   ->  Sort  (cost=1975875.27..1975875.28 rows=1 width=26) (actual time=40027.695..40027.702 rows=100 loops=1)
         Sort Key: (count(*)), supplier.s_name
         Sort Method: top-N heapsort  Memory: 32kB
         Buffers: shared hit=13764655 read=574751 written=7565
         ->  HashAggregate  (cost=1975875.25..1975875.26 rows=1 width=26) (actual time=40025.484..40026.562 rows=3934 loops=1)
               Group Key: supplier.s_name
               Buffers: shared hit=13764647 read=574751 written=7565
               ->  Nested Loop Anti Join  (cost=2443.74..1975875.25 rows=1 width=26) (actual time=14.994..39969.254 rows=39127 loops=1)
                     Buffers: shared hit=13764647 read=574751 written=7565
                     ->  Nested Loop Semi Join  (cost=2443.17..1975873.94 rows=1 width=34) (actual time=14.859..37142.249 rows=694105 loops=1)
                           Join Filter: (orders.o_orderkey = l2.l_orderkey)
                           Buffers: shared hit=10287453 read=573292 written=7551
                           ->  Nested Loop  (cost=2442.61..1447643.50 rows=395275 width=38) (actual time=14.797..32364.956 rows=720399 loops=1)
                                 Buffers: shared hit=6769008 read=484359 written=6058
                                 ->  Hash Join  (cost=2442.17..1021499.13 rows=809404 width=34) (actual time=14.762..25104.011 rows=1489773 loops=1)
                                       Hash Cond: (l1.l_suppkey = supplier.s_suppkey)
                                       Buffers: shared hit=826304 read=459886 written=5789
                                       ->  Index Scan using lineitem_l_orderkey_idx_part1 on lineitem l1  (cost=0.56..935081.85 rows=20235102 width=8) (actual time=0.085..17395.601 rows=37928071 loops=1)
                                             Buffers: shared hit=824454 read=459875 written=5789
                                       ->  Hash  (cost=2391.61..2391.61 rows=4000 width=30) (actual time=14.562..14.562 rows=3934 loops=1)
                                             Buckets: 4096  Batches: 1  Memory Usage: 278kB
                                             Buffers: shared hit=1847 read=11
                                             ->  Nested Loop  (cost=79.29..2391.61 rows=4000 width=30) (actual time=1.123..13.391 rows=3934 loops=1)
                                                   Buffers: shared hit=1847 read=11
                                                   ->  Seq Scan on nation  (cost=0.00..1.31 rows=1 width=4) (actual time=0.009..0.019 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=1.108..12.658 rows=3934 loops=1)
                                                         Recheck Cond: (s_nationkey = nation.n_nationkey)
                                                         Heap Blocks: exact=1845
                                                         Buffers: shared hit=1846 read=11
                                                         ->  Bitmap Index Scan on supplier_s_nationkey_s_suppkey_idx  (cost=0.00..78.29 rows=4000 width=0) (actual time=0.819..0.819 rows=3934 loops=1)
                                                               Index Cond: (s_nationkey = nation.n_nationkey)
                                                               Buffers: shared hit=1 read=11
                                 ->  Index Scan using pk_orders on orders  (cost=0.43..0.52 rows=1 width=4) (actual time=0.004..0.004 rows=0 loops=1489773)
                                       Index Cond: (o_orderkey = l1.l_orderkey)
                                       Filter: (o_orderstatus = 'F'::bpchar)
                                       Rows Removed by Filter: 1
                                       Buffers: shared hit=5942704 read=24473 written=269
                           ->  Index Scan using pk_lineitem on lineitem l2  (cost=0.56..1.15 rows=15 width=8) (actual time=0.006..0.006 rows=1 loops=720399)
                                 Index Cond: (l_orderkey = l1.l_orderkey)
                                 Filter: (l_suppkey <> l1.l_suppkey)
                                 Rows Removed by Filter: 0
                                 Buffers: shared hit=3518445 read=88933 written=1493
                     ->  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=694105)
                           Index Cond: (l_orderkey = l1.l_orderkey)
                           Filter: (l_suppkey <> l1.l_suppkey)
                           Rows Removed by Filter: 0
                           Buffers: shared hit=3477194 read=1459 written=14
 Planning time: 10.780 ms
 Execution time: 40028.100 ms
(54 rows)

COMMIT;
COMMIT