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 '1995-03-18'
	and l_shipdate > date '1995-03-18'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2699591.85..2699591.88 rows=10 width=20) (actual time=32884.003..32884.006 rows=10 loops=1)
   Buffers: shared hit=708636 read=663623 dirtied=1529 written=2935
   ->  Sort  (cost=2699591.85..2707570.35 rows=3191401 width=20) (actual time=32884.000..32884.000 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=708636 read=663623 dirtied=1529 written=2935
         ->  HashAggregate  (cost=2598712.81..2630626.82 rows=3191401 width=20) (actual time=32816.469..32863.137 rows=114073 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=708630 read=663623 dirtied=1529 written=2935
               ->  Hash Join  (cost=557295.70..2550841.80 rows=3191401 width=20) (actual time=8871.115..32272.353 rows=301949 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=708630 read=663623 dirtied=1529 written=2935
                     ->  Seq Scan on lineitem  (cost=0.00..1838833.75 rows=32746222 width=12) (actual time=0.056..18133.025 rows=32289408 loops=1)
                           Filter: (l_shipdate > '1995-03-18'::date)
                           Rows Removed by Filter: 27755889
                           Buffers: shared hit=576663 read=502599 dirtied=881 written=665
                     ->  Hash  (cost=538784.77..538784.77 rows=1480875 width=12) (actual time=8863.081..8863.081 rows=1466966 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 79418kB
                           Buffers: shared hit=131967 read=161024 dirtied=648 written=2270
                           ->  Hash Join  (cost=49741.42..538784.77 rows=1480875 width=12) (actual time=775.358..8355.074 rows=1466966 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=131967 read=161024 dirtied=648 written=2270
                                 ->  Seq Scan on orders  (cost=0.00..446496.39 rows=7396857 width=16) (actual time=0.022..5086.185 rows=7316009 loops=1)
                                       Filter: (o_orderdate < '1995-03-18'::date)
                                       Rows Removed by Filter: 7698991
                                       Buffers: shared hit=131965 read=124595 dirtied=648 written=405
                                 ->  Hash  (cost=45987.60..45987.60 rows=300305 width=4) (actual time=772.859..772.859 rows=300276 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14653kB
                                       Buffers: shared hit=2 read=36429 written=1865
                                       ->  Bitmap Heap Scan on customer  (cost=6955.79..45987.60 rows=300305 width=4) (actual time=76.760..680.721 rows=300276 loops=1)
                                             Recheck Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                             Heap Blocks: exact=35277
                                             Buffers: shared hit=2 read=36429 written=1865
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6880.72 rows=300305 width=0) (actual time=67.267..67.267 rows=300276 loops=1)
                                                   Index Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                                   Buffers: shared read=1154 written=148
 Planning time: 3.932 ms
 Execution time: 32905.155 ms
(38 rows)

COMMIT;
COMMIT