BEGIN;
BEGIN
EXPLAIN (ANALYZE, BUFFERS)
select
	o_orderpriority,
	count(*) as order_count
from
	orders
where
	o_orderdate >= date '1995-08-01'
	and o_orderdate < cast(date '1995-08-01' + interval '3 month' as date)
	and exists (
		select
			*
		from
			lineitem
		where
			l_orderkey = o_orderkey
			and l_commitdate < l_receiptdate
	)
group by
	o_orderpriority
order by
	o_orderpriority;
                                                                                         QUERY PLAN                                                                                          
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=1294990.17..1294990.17 rows=1 width=16) (actual time=70814.257..70814.258 rows=5 loops=1)
   Sort Key: orders.o_orderpriority
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=1223769 read=290750 written=3810
   ->  HashAggregate  (cost=1294990.15..1294990.16 rows=1 width=16) (actual time=70814.108..70814.111 rows=5 loops=1)
         Buffers: shared hit=1223764 read=290750 written=3810
         ->  Hash Join  (cost=1024651.16..1294222.97 rows=153435 width=16) (actual time=60056.051..70593.271 rows=526166 loops=1)
               Hash Cond: (orders.o_orderkey = lineitem.l_orderkey)
               Buffers: shared hit=1223764 read=290750 written=3810
               ->  Bitmap Heap Scan on orders  (cost=12558.81..276547.72 rows=579594 width=20) (actual time=496.064..2032.013 rows=574146 loops=1)
                     Recheck Cond: ((o_orderdate >= '1995-08-01'::date) AND (o_orderdate < '1995-11-01'::date))
                     Buffers: shared hit=227557 read=4121
                     ->  Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx  (cost=0.00..12413.92 rows=579594 width=0) (actual time=377.708..377.708 rows=578136 loops=1)
                           Index Cond: ((o_orderdate >= '1995-08-01'::date) AND (o_orderdate < '1995-11-01'::date))
                           Buffers: shared read=1648
               ->  Hash  (cost=995414.46..995414.46 rows=1334231 width=4) (actual time=59558.332..59558.332 rows=13767175 loops=1)
                     Buckets: 262144  Batches: 1  Memory Usage: 484003kB
                     Buffers: shared hit=996207 read=286629 written=3810
                     ->  HashAggregate  (cost=982072.15..995414.46 rows=1334231 width=4) (actual time=45139.470..54955.483 rows=13767175 loops=1)
                           Buffers: shared hit=996207 read=286629 written=3810
                           ->  Index Scan using lineitem_l_orderkey_idx_part1 on lineitem  (cost=0.00..931684.69 rows=20154984 width=4) (actual time=0.222..18863.230 rows=37965693 loops=1)
                                 Buffers: shared hit=996207 read=286629 written=3810
 Total runtime: 71078.363 ms
(23 rows)

COMMIT;
COMMIT