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 = 'MACHINERY'
	and c_custkey = o_custkey
	and l_orderkey = o_orderkey
	and o_orderdate < date '1995-03-10'
	and l_shipdate > date '1995-03-10'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2741311.37..2741311.40 rows=10 width=20) (actual time=37796.306..37796.318 rows=10 loops=1)
   Buffers: shared hit=838787 read=517647
   ->  Sort  (cost=2741311.37..2749184.83 rows=3149382 width=20) (actual time=37796.293..37796.295 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=838787 read=517647
         ->  HashAggregate  (cost=2641760.54..2673254.36 rows=3149382 width=20) (actual time=37741.015..37777.726 rows=113490 loops=1)
               Buffers: shared hit=838781 read=517647
               ->  Hash Join  (cost=624006.90..2594519.81 rows=3149382 width=20) (actual time=10875.353..37523.595 rows=299681 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=838781 read=517647
                     ->  Seq Scan on lineitem  (cost=0.00..1817038.70 rows=32528103 width=12) (actual time=0.037..18119.061 rows=32491428 loops=1)
                           Filter: (l_shipdate > '1995-03-10'::date)
                           Rows Removed by Filter: 27554241
                           Buffers: shared hit=549983 read=516492
                     ->  Hash  (cost=605834.95..605834.95 rows=1453756 width=12) (actual time=10872.748..10872.748 rows=1452519 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 62413kB
                           Buffers: shared hit=288798 read=1155
                           ->  Hash Join  (cost=49660.32..605834.95 rows=1453756 width=12) (actual time=438.980..10420.296 rows=1452519 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=288798 read=1155
                                 ->  Seq Scan on orders  (cost=0.00..441209.30 rows=7303838 width=16) (actual time=0.014..4679.176 rows=7265540 loops=1)
                                       Filter: (o_orderdate < '1995-03-10'::date)
                                       Rows Removed by Filter: 7749460
                                       Buffers: shared hit=253522
                                 ->  Hash  (cost=45928.32..45928.32 rows=298560 width=4) (actual time=438.703..438.703 rows=300441 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10563kB
                                       Buffers: shared hit=35276 read=1155
                                       ->  Bitmap Heap Scan on customer  (cost=6918.32..45928.32 rows=298560 width=4) (actual time=67.709..370.942 rows=300441 loops=1)
                                             Recheck Cond: (c_mktsegment = 'MACHINERY'::bpchar)
                                             Buffers: shared hit=35276 read=1155
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6843.68 rows=298560 width=0) (actual time=59.029..59.029 rows=300441 loops=1)
                                                   Index Cond: (c_mktsegment = 'MACHINERY'::bpchar)
                                                   Buffers: shared read=1155
 Total runtime: 37826.240 ms
(35 rows)

COMMIT;
COMMIT