BEGIN;
BEGIN
EXPLAIN (ANALYZE, BUFFERS)
select
	l_orderkey,
	sum(l_extendedprice * (1 - l_discount)) as revenue,
	o_orderdate,
	o_shippriority
from
	customer,
	orders,
	lineitem
where
	c_mktsegment = 'FURNITURE'
	and c_custkey = o_custkey
	and l_orderkey = o_orderkey
	and o_orderdate < date '1995-03-09'
	and l_shipdate > date '1995-03-09'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2700568.33..2700568.35 rows=10 width=20) (actual time=38357.760..38357.765 rows=10 loops=1)
   Buffers: shared hit=1052558 read=319695 dirtied=2 written=18
   ->  Sort  (cost=2700568.33..2708561.58 rows=3197300 width=20) (actual time=38357.753..38357.754 rows=10 loops=1)
         Sort Key: (sum((lineitem.l_extendedprice * (1::double precision - lineitem.l_discount)))), orders.o_orderdate
         Sort Method: top-N heapsort  Memory: 25kB
         Buffers: shared hit=1052558 read=319695 dirtied=2 written=18
         ->  HashAggregate  (cost=2599502.83..2631475.83 rows=3197300 width=20) (actual time=38250.684..38335.948 rows=113518 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=1052552 read=319695 dirtied=2 written=18
               ->  Hash Join  (cost=556893.73..2551543.33 rows=3197300 width=20) (actual time=12685.473..37983.716 rows=299177 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=1052552 read=319695 dirtied=2 written=18
                     ->  Seq Scan on lineitem  (cost=0.00..1838832.43 rows=33025113 width=12) (actual time=0.036..17724.756 rows=32515065 loops=1)
                           Filter: (l_shipdate > '1995-03-09'::date)
                           Rows Removed by Filter: 27530232
                           Buffers: shared hit=914508 read=164754 dirtied=2 written=13
                     ->  Hash  (cost=538505.19..538505.19 rows=1471083 width=12) (actual time=12669.263..12669.263 rows=1452522 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 78798kB
                           Buffers: shared hit=138044 read=154941 written=5
                           ->  Hash Join  (cost=49740.43..538505.19 rows=1471083 width=12) (actual time=894.896..11931.222 rows=1452522 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=138044 read=154941 written=5
                                 ->  Seq Scan on orders  (cost=0.00..446496.39 rows=7348677 width=16) (actual time=0.039..5929.873 rows=7259713 loops=1)
                                       Filter: (o_orderdate < '1995-03-09'::date)
                                       Rows Removed by Filter: 7755287
                                       Buffers: shared hit=138042 read=118518 written=5
                                 ->  Hash  (cost=45987.00..45987.00 rows=300275 width=4) (actual time=890.363..890.363 rows=299496 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14626kB
                                       Buffers: shared hit=2 read=36423
                                       ->  Bitmap Heap Scan on customer  (cost=6955.56..45987.00 rows=300275 width=4) (actual time=88.904..764.890 rows=299496 loops=1)
                                             Recheck Cond: (c_mktsegment = 'FURNITURE'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=2 read=36423
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6880.49 rows=300275 width=0) (actual time=76.211..76.211 rows=299496 loops=1)
                                                   Index Cond: (c_mktsegment = 'FURNITURE'::bpchar)
                                                   Buffers: shared read=1150
 Planning time: 4.573 ms
 Execution time: 38394.811 ms
(38 rows)

COMMIT;
COMMIT