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=1956229.39..1956229.40 rows=1 width=26) (actual time=42551.309..42551.328 rows=100 loops=1)
   Buffers: shared hit=13776117 read=883951 dirtied=1161 written=197
   ->  Sort  (cost=1956229.39..1956229.40 rows=1 width=26) (actual time=42551.306..42551.313 rows=100 loops=1)
         Sort Key: (count(*)), supplier.s_name
         Sort Method: top-N heapsort  Memory: 32kB
         Buffers: shared hit=13776117 read=883951 dirtied=1161 written=197
         ->  HashAggregate  (cost=1956229.37..1956229.38 rows=1 width=26) (actual time=42548.079..42550.055 rows=4029 loops=1)
               Group Key: supplier.s_name
               Buffers: shared hit=13776109 read=883951 dirtied=1161 written=197
               ->  Nested Loop Anti Join  (cost=2443.74..1956229.37 rows=1 width=26) (actual time=17.428..42486.199 rows=39732 loops=1)
                     Buffers: shared hit=13776109 read=883951 dirtied=1161 written=197
                     ->  Nested Loop Semi Join  (cost=2443.17..1956228.06 rows=1 width=34) (actual time=15.119..39669.556 rows=712125 loops=1)
                           Join Filter: (orders.o_orderkey = l2.l_orderkey)
                           Buffers: shared hit=10209382 read=881740 dirtied=1161 written=197
                           ->  Nested Loop  (cost=2442.61..1433316.93 rows=391374 width=38) (actual time=15.095..34515.713 rows=738692 loops=1)
                                 Buffers: shared hit=6656434 read=735626 dirtied=1161 written=192
                                 ->  Hash Join  (cost=2442.17..1011444.06 rows=801415 width=34) (actual time=14.903..26118.911 rows=1528960 loops=1)
                                       Hash Cond: (l1.l_suppkey = supplier.s_suppkey)
                                       Buffers: shared hit=593083 read=674716 dirtied=908 written=163
                                       ->  Index Scan using lineitem_l_orderkey_idx_part1 on lineitem l1  (cost=0.56..925855.65 rows=20035376 width=8) (actual time=0.069..18194.903 rows=37966905 loops=1)
                                             Buffers: shared hit=591238 read=674703 dirtied=908 written=163
                                       ->  Hash  (cost=2391.61..2391.61 rows=4000 width=30) (actual time=14.781..14.781 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=1.280..13.671 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=0.010..0.015 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=1.264..12.894 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=0.972..0.972 rows=4029 loops=1)
                                                               Index Cond: (s_nationkey = nation.n_nationkey)
                                                               Buffers: shared read=13
                                 ->  Index Scan using pk_orders on orders  (cost=0.43..0.52 rows=1 width=4) (actual time=0.005..0.005 rows=0 loops=1528960)
                                       Index Cond: (o_orderkey = l1.l_orderkey)
                                       Filter: (o_orderstatus = 'F'::bpchar)
                                       Rows Removed by Filter: 1
                                       Buffers: shared hit=6063351 read=60910 dirtied=253 written=29
                           ->  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=738692)
                                 Index Cond: (l_orderkey = l1.l_orderkey)
                                 Filter: (l_suppkey <> l1.l_suppkey)
                                 Rows Removed by Filter: 0
                                 Buffers: shared hit=3552948 read=146114 written=5
                     ->  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=712125)
                           Index Cond: (l_orderkey = l1.l_orderkey)
                           Filter: (l_suppkey <> l1.l_suppkey)
                           Rows Removed by Filter: 0
                           Buffers: shared hit=3566727 read=2211
 Planning time: 10.386 ms
 Execution time: 42551.724 ms
(54 rows)

COMMIT;
COMMIT