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 '1995-03-28'
	and l_shipdate > date '1995-03-28'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2745452.63..2745452.65 rows=10 width=20) (actual time=66226.269..66226.273 rows=10 loops=1)
   Buffers: shared hit=1085072 read=274002 dirtied=252 written=47
   ->  Sort  (cost=2745452.63..2753312.44 rows=3143923 width=20) (actual time=66226.264..66226.265 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=1085072 read=274002 dirtied=252 written=47
         ->  HashAggregate  (cost=2646074.35..2677513.58 rows=3143923 width=20) (actual time=66134.977..66205.276 rows=113992 loops=1)
               Buffers: shared hit=1085066 read=274002 dirtied=252 written=47
               ->  Hash Join  (cost=626394.17..2598915.51 rows=3143923 width=20) (actual time=25255.370..65802.437 rows=301671 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=1085066 read=274002 dirtied=252 written=47
                     ->  Seq Scan on lineitem  (cost=0.00..1820682.79 rows=32106485 width=12) (actual time=0.061..21230.030 rows=32040195 loops=1)
                           Filter: (l_shipdate > '1995-03-28'::date)
                           Rows Removed by Filter: 28005184
                           Buffers: shared hit=889903 read=178705
                     ->  Hash  (cost=607978.82..607978.82 rows=1473228 width=12) (actual time=25253.036..25253.036 rows=1479393 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 63568kB
                           Buffers: shared hit=195163 read=95297 dirtied=252 written=47
                           ->  Hash Join  (cost=49703.11..607978.82 rows=1473228 width=12) (actual time=672.620..24470.433 rows=1479393 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=195163 read=95297 dirtied=252 written=47
                                 ->  Seq Scan on orders  (cost=0.00..442089.90 rows=7378439 width=16) (actual time=0.017..6020.002 rows=7377907 loops=1)
                                       Filter: (o_orderdate < '1995-03-28'::date)
                                       Rows Removed by Filter: 7637093
                                       Buffers: shared hit=161140 read=92888 dirtied=252 written=47
                                 ->  Hash  (cost=45959.36..45959.36 rows=299500 width=4) (actual time=672.377..672.377 rows=300276 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10557kB
                                       Buffers: shared hit=34023 read=2409
                                       ->  Bitmap Heap Scan on customer  (cost=6937.61..45959.36 rows=299500 width=4) (actual time=73.953..534.647 rows=300276 loops=1)
                                             Recheck Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                             Buffers: shared hit=34023 read=2409
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6862.73 rows=299500 width=0) (actual time=64.126..64.126 rows=300276 loops=1)
                                                   Index Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                                   Buffers: shared read=1155
 Total runtime: 66262.225 ms
(35 rows)

COMMIT;
COMMIT