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 = 'BUILDING'
	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=2682923.22..2682923.24 rows=10 width=20) (actual time=36715.237..36715.241 rows=10 loops=1)
   Buffers: shared hit=973699 read=390635 written=16
   ->  Sort  (cost=2682923.22..2690813.81 rows=3156237 width=20) (actual time=36715.233..36715.235 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=973699 read=390635 written=16
         ->  HashAggregate  (cost=2583155.70..2614718.07 rows=3156237 width=20) (actual time=36645.067..36694.358 rows=114014 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=973693 read=390635 written=16
               ->  Hash Join  (cost=553840.39..2535812.14 rows=3156237 width=20) (actual time=10735.657..36330.501 rows=301970 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=973693 read=390635 written=16
                     ->  Seq Scan on lineitem  (cost=0.00..1827919.74 rows=32663906 width=12) (actual time=0.030..18409.934 rows=32457480 loops=1)
                           Filter: (l_shipdate > '1995-03-10'::date)
                           Rows Removed by Filter: 27527429
                           Buffers: shared hit=718649 read=354207 written=5
                     ->  Hash  (cost=535595.94..535595.94 rows=1459556 width=12) (actual time=10720.501..10720.501 rows=1455457 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 78924kB
                           Buffers: shared hit=255044 read=36428 written=11
                           ->  Hash Join  (cost=49672.78..535595.94 rows=1459556 width=12) (actual time=753.471..10043.636 rows=1455457 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=255044 read=36428 written=11
                                 ->  Seq Scan on orders  (cost=0.00..443852.85 rows=7326599 width=16) (actual time=0.025..4750.640 rows=7258474 loops=1)
                                       Filter: (o_orderdate < '1995-03-10'::date)
                                       Rows Removed by Filter: 7741526
                                       Buffers: shared hit=255041
                                 ->  Hash  (cost=45937.53..45937.53 rows=298820 width=4) (actual time=749.752..749.752 rows=300276 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14653kB
                                       Buffers: shared hit=3 read=36428 written=11
                                       ->  Bitmap Heap Scan on customer  (cost=6924.28..45937.53 rows=298820 width=4) (actual time=70.658..651.537 rows=300276 loops=1)
                                             Recheck Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                             Heap Blocks: exact=35277
                                             Buffers: shared hit=3 read=36428 written=11
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6849.58 rows=298820 width=0) (actual time=61.988..61.988 rows=300276 loops=1)
                                                   Index Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                                   Buffers: shared read=1154 written=1
 Planning time: 3.786 ms
 Execution time: 36749.137 ms
(38 rows)

COMMIT;
COMMIT