BEGIN;
BEGIN
EXPLAIN (ANALYZE, BUFFERS)
select
	o_orderpriority,
	count(*) as order_count
from
	orders
where
	o_orderdate >= date '1994-08-01'
	and o_orderdate < cast(date '1994-08-01' + 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=1292320.19..1292320.19 rows=1 width=16) (actual time=91538.232..91538.233 rows=5 loops=1)
   Sort Key: orders.o_orderpriority
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=1116207 read=395119 written=50
   ->  HashAggregate  (cost=1292320.17..1292320.18 rows=1 width=16) (actual time=91538.074..91538.074 rows=5 loops=1)
         Buffers: shared hit=1116202 read=395119 written=50
         ->  Hash Join  (cost=1022764.10..1291559.37 rows=152160 width=16) (actual time=78144.516..91233.327 rows=525908 loops=1)
               Hash Cond: (orders.o_orderkey = lineitem.l_orderkey)
               Buffers: shared hit=1116202 read=395119 written=50
               ->  Bitmap Heap Scan on orders  (cost=12124.70..275438.69 rows=568466 width=20) (actual time=554.776..3115.529 rows=573760 loops=1)
                     Recheck Cond: ((o_orderdate >= '1994-08-01'::date) AND (o_orderdate < '1994-11-01'::date))
                     Buffers: shared hit=177049 read=54067 written=13
                     ->  Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx  (cost=0.00..11982.58 rows=568466 width=0) (actual time=412.928..412.928 rows=576631 loops=1)
                           Index Cond: ((o_orderdate >= '1994-08-01'::date) AND (o_orderdate < '1994-11-01'::date))
                           Buffers: shared read=1601
               ->  Hash  (cost=993809.88..993809.88 rows=1346362 width=4) (actual time=77587.461..77587.461 rows=13767164 loops=1)
                     Buckets: 262144  Batches: 1  Memory Usage: 484002kB
                     Buffers: shared hit=939153 read=341052 written=37
                     ->  HashAggregate  (cost=980346.26..993809.88 rows=1346362 width=4) (actual time=62044.143..72689.358 rows=13767164 loops=1)
                           Buffers: shared hit=939153 read=341052 written=37
                           ->  Index Scan using lineitem_l_orderkey_idx_part1 on lineitem  (cost=0.00..930058.16 rows=20115240 width=4) (actual time=0.187..28884.834 rows=37966560 loops=1)
                                 Buffers: shared hit=939153 read=341052 written=37
 Total runtime: 91898.171 ms
(23 rows)

COMMIT;
COMMIT