BEGIN;
BEGIN
EXPLAIN (ANALYZE, BUFFERS)
select
	o_orderpriority,
	count(*) as order_count
from
	orders
where
	o_orderdate >= date '1997-06-01'
	and o_orderdate < cast(date '1997-06-01' + 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=1291158.29..1291158.30 rows=1 width=16) (actual time=83214.195..83214.195 rows=5 loops=1)
   Sort Key: orders.o_orderpriority
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=568909 read=940972 written=26811
   ->  HashAggregate  (cost=1291158.27..1291158.28 rows=1 width=16) (actual time=83214.040..83214.043 rows=5 loops=1)
         Buffers: shared hit=568904 read=940972 written=26811
         ->  Hash Join  (cost=1021666.08..1290379.12 rows=155831 width=16) (actual time=71287.520..82923.572 rows=526993 loops=1)
               Hash Cond: (orders.o_orderkey = lineitem.l_orderkey)
               Buffers: shared hit=568904 read=940972 written=26811
               ->  Bitmap Heap Scan on orders  (cost=12193.10..275354.21 rows=575141 width=20) (actual time=488.872..2297.607 rows=574868 loops=1)
                     Recheck Cond: ((o_orderdate >= '1997-06-01'::date) AND (o_orderdate < '1997-09-01'::date))
                     Buffers: shared hit=225465 read=5435
                     ->  Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx  (cost=0.00..12049.31 rows=575141 width=0) (actual time=361.541..361.541 rows=577216 loops=1)
                           Index Cond: ((o_orderdate >= '1997-06-01'::date) AND (o_orderdate < '1997-09-01'::date))
                           Buffers: shared read=1579
               ->  Hash  (cost=992454.41..992454.41 rows=1361486 width=4) (actual time=70796.796..70796.796 rows=13767198 loops=1)
                     Buckets: 262144  Batches: 1  Memory Usage: 484004kB
                     Buffers: shared hit=343439 read=935537 written=26811
                     ->  HashAggregate  (cost=978839.55..992454.41 rows=1361486 width=4) (actual time=57403.671..67177.721 rows=13767198 loops=1)
                           Buffers: shared hit=343439 read=935537 written=26811
                           ->  Index Scan using lineitem_l_orderkey_idx_part1 on lineitem  (cost=0.00..928601.79 rows=20095105 width=4) (actual time=0.121..25327.673 rows=37966982 loops=1)
                                 Buffers: shared hit=343439 read=935537 written=26811
 Total runtime: 83589.924 ms
(23 rows)

COMMIT;
COMMIT