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 = 'AUTOMOBILE'
	and c_custkey = o_custkey
	and l_orderkey = o_orderkey
	and o_orderdate < date '1995-03-19'
	and l_shipdate > date '1995-03-19'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2673802.94..2673802.97 rows=10 width=20) (actual time=36918.570..36918.573 rows=10 loops=1)
   Buffers: shared hit=880831 read=477631 written=823
   ->  Sort  (cost=2673802.94..2681750.88 rows=3179176 width=20) (actual time=36918.567..36918.568 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=880831 read=477631 written=823
         ->  HashAggregate  (cost=2573310.33..2605102.09 rows=3179176 width=20) (actual time=36850.625..36897.857 rows=113906 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=880825 read=477631 written=823
               ->  Hash Join  (cost=552057.06..2525622.69 rows=3179176 width=20) (actual time=10671.055..36606.973 rows=300486 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=880825 read=477631 written=823
                     ->  Seq Scan on lineitem  (cost=0.00..1820077.14 rows=32452461 width=12) (actual time=0.042..18737.133 rows=32233419 loops=1)
                           Filter: (l_shipdate > '1995-03-19'::date)
                           Rows Removed by Filter: 27752133
                           Buffers: shared hit=615550 read=452704
                     ->  Hash  (cost=533652.10..533652.10 rows=1472397 width=12) (actual time=10649.954..10649.954 rows=1462844 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 79241kB
                           Buffers: shared hit=265275 read=24927 written=823
                           ->  Hash Join  (cost=49796.13..533652.10 rows=1472397 width=12) (actual time=633.928..9997.041 rows=1462844 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=265275 read=24927 written=823
                                 ->  Seq Scan on orders  (cost=0.00..441649.60 rows=7328640 width=16) (actual time=0.041..4980.852 rows=7314750 loops=1)
                                       Filter: (o_orderdate < '1995-03-19'::date)
                                       Rows Removed by Filter: 7685250
                                       Buffers: shared hit=230385 read=23390 written=759
                                 ->  Hash  (cost=46029.07..46029.07 rows=301365 width=4) (actual time=627.673..627.673 rows=300036 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14645kB
                                       Buffers: shared hit=34890 read=1537 written=64
                                       ->  Bitmap Heap Scan on customer  (cost=6984.01..46029.07 rows=301365 width=4) (actual time=99.742..488.485 rows=300036 loops=1)
                                             Recheck Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=34890 read=1537 written=64
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6908.66 rows=301365 width=0) (actual time=87.131..87.131 rows=300036 loops=1)
                                                   Index Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                                   Buffers: shared read=1152 written=53
 Planning time: 4.163 ms
 Execution time: 36947.466 ms
(38 rows)

COMMIT;
COMMIT