BEGIN;
BEGIN
EXPLAIN (ANALYZE, BUFFERS)
select
	o_orderpriority,
	count(*) as order_count
from
	orders
where
	o_orderdate >= date '1995-10-01'
	and o_orderdate < cast(date '1995-10-01' + 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=1294812.94..1294812.94 rows=1 width=16) (actual time=84645.363..84645.363 rows=5 loops=1)
   Sort Key: orders.o_orderpriority
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=777024 read=746740 dirtied=762 written=301
   ->  HashAggregate  (cost=1294812.92..1294812.93 rows=1 width=16) (actual time=84645.236..84645.237 rows=5 loops=1)
         Buffers: shared hit=777019 read=746740 dirtied=762 written=301
         ->  Hash Join  (cost=1024714.54..1294043.93 rows=153798 width=16) (actual time=72436.703..84339.508 rows=525612 loops=1)
               Hash Cond: (orders.o_orderkey = lineitem.l_orderkey)
               Buffers: shared hit=777019 read=746740 dirtied=762 written=301
               ->  Bitmap Heap Scan on orders  (cost=12337.67..276172.71 rows=569336 width=20) (actual time=464.410..2190.775 rows=573189 loops=1)
                     Recheck Cond: ((o_orderdate >= '1995-10-01'::date) AND (o_orderdate < '1996-01-01'::date))
                     Buffers: shared hit=226937 read=4771 dirtied=2 written=192
                     ->  Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx  (cost=0.00..12195.34 rows=569336 width=0) (actual time=312.928..312.928 rows=577261 loops=1)
                           Index Cond: ((o_orderdate >= '1995-10-01'::date) AND (o_orderdate < '1996-01-01'::date))
                           Buffers: shared hit=72 read=1570 written=1
               ->  Hash  (cost=995358.29..995358.29 rows=1361486 width=4) (actual time=71970.657..71970.657 rows=13767175 loops=1)
                     Buckets: 262144  Batches: 1  Memory Usage: 484003kB
                     Buffers: shared hit=550082 read=741969 dirtied=760 written=109
                     ->  HashAggregate  (cost=981743.43..995358.29 rows=1361486 width=4) (actual time=58770.104..68664.783 rows=13767175 loops=1)
                           Buffers: shared hit=550082 read=741969 dirtied=760 written=109
                           ->  Index Scan using lineitem_l_orderkey_idx_part1 on lineitem  (cost=0.00..931356.56 rows=20154748 width=4) (actual time=0.124..25896.615 rows=37965693 loops=1)
                                 Buffers: shared hit=550082 read=741969 dirtied=760 written=109
 Total runtime: 85000.784 ms
(23 rows)

COMMIT;
COMMIT