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 '1995-03-22'
	and l_shipdate > date '1995-03-22'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2670537.13..2670537.15 rows=10 width=20) (actual time=37393.307..37393.312 rows=10 loops=1)
   Buffers: shared hit=691991 read=665767 dirtied=2 written=14
   ->  Sort  (cost=2670537.13..2678427.38 rows=3156100 width=20) (actual time=37393.302..37393.303 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=691991 read=665767 dirtied=2 written=14
         ->  HashAggregate  (cost=2570773.94..2602334.94 rows=3156100 width=20) (actual time=37314.336..37372.941 rows=114180 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=691985 read=665767 dirtied=2 written=14
               ->  Hash Join  (cost=552012.24..2523432.44 rows=3156100 width=20) (actual time=10839.217..36999.101 rows=302167 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=691985 read=665767 dirtied=2 written=14
                     ->  Seq Scan on lineitem  (cost=0.00..1818872.16 rows=32263210 width=12) (actual time=0.030..19169.090 rows=32190394 loops=1)
                           Filter: (l_shipdate > '1995-03-22'::date)
                           Rows Removed by Filter: 27855209
                           Buffers: shared hit=484305 read=583241 dirtied=2 written=7
                     ->  Hash  (cost=533633.69..533633.69 rows=1470284 width=12) (actual time=10826.894..10826.894 rows=1472223 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 79644kB
                           Buffers: shared hit=207680 read=82526 written=7
                           ->  Hash Join  (cost=49741.42..533633.69 rows=1470284 width=12) (actual time=816.728..10102.141 rows=1472223 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=207680 read=82526 written=7
                                 ->  Seq Scan on orders  (cost=0.00..441649.60 rows=7343956 width=16) (actual time=0.027..5233.810 rows=7340860 loops=1)
                                       Filter: (o_orderdate < '1995-03-22'::date)
                                       Rows Removed by Filter: 7674140
                                       Buffers: shared hit=207456 read=46319 written=7
                                 ->  Hash  (cost=45987.60..45987.60 rows=300305 width=4) (actual time=812.999..812.999 rows=300276 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14653kB
                                       Buffers: shared hit=224 read=36207
                                       ->  Bitmap Heap Scan on customer  (cost=6955.79..45987.60 rows=300305 width=4) (actual time=76.911..707.257 rows=300276 loops=1)
                                             Recheck Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                             Heap Blocks: exact=35277
                                             Buffers: shared hit=224 read=36207
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6880.72 rows=300305 width=0) (actual time=66.825..66.825 rows=300276 loops=1)
                                                   Index Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                                   Buffers: shared read=1154
 Planning time: 3.934 ms
 Execution time: 37699.364 ms
(38 rows)

COMMIT;
COMMIT