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 '1995-03-13'
	and l_shipdate > date '1995-03-13'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2693338.36..2693338.39 rows=10 width=20) (actual time=38090.091..38090.095 rows=10 loops=1)
   Buffers: shared hit=881433 read=486847 dirtied=226 written=194
   ->  Sort  (cost=2693338.36..2701337.25 rows=3199556 width=20) (actual time=38090.087..38090.088 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=881433 read=486847 dirtied=226 written=194
         ->  HashAggregate  (cost=2592201.55..2624197.11 rows=3199556 width=20) (actual time=38001.889..38069.587 rows=113889 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=881427 read=486847 dirtied=226 written=194
               ->  Hash Join  (cost=555755.60..2544208.21 rows=3199556 width=20) (actual time=9921.859..37707.332 rows=300675 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=881427 read=486847 dirtied=226 written=194
                     ->  Seq Scan on lineitem  (cost=0.00..1833353.05 rows=32827733 width=12) (actual time=0.038..19469.201 rows=32414041 loops=1)
                           Filter: (l_shipdate > '1995-03-13'::date)
                           Rows Removed by Filter: 27630135
                           Buffers: shared hit=714695 read=361351
                     ->  Hash  (cost=537298.21..537298.21 rows=1476591 width=12) (actual time=9906.633..9906.633 rows=1456790 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 78981kB
                           Buffers: shared hit=166732 read=125496 dirtied=226 written=194
                           ->  Hash Join  (cost=49796.13..537298.21 rows=1476591 width=12) (actual time=677.952..9299.126 rows=1456790 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=166732 read=125496 dirtied=226 written=194
                                 ->  Seq Scan on orders  (cost=0.00..445175.49 rows=7349516 width=16) (actual time=0.031..5526.362 rows=7284649 loops=1)
                                       Filter: (o_orderdate < '1995-03-13'::date)
                                       Rows Removed by Filter: 7730351
                                       Buffers: shared hit=148915 read=106886 dirtied=226 written=158
                                 ->  Hash  (cost=46029.07..46029.07 rows=301365 width=4) (actual time=674.445..674.445 rows=300036 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14645kB
                                       Buffers: shared hit=17817 read=18610 written=36
                                       ->  Bitmap Heap Scan on customer  (cost=6984.01..46029.07 rows=301365 width=4) (actual time=79.073..572.775 rows=300036 loops=1)
                                             Recheck Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=17817 read=18610 written=36
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6908.66 rows=301365 width=0) (actual time=69.973..69.973 rows=300036 loops=1)
                                                   Index Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                                   Buffers: shared read=1152 written=3
 Planning time: 3.843 ms
 Execution time: 38114.733 ms
(38 rows)

COMMIT;
COMMIT