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 '1995-03-03'
	and l_shipdate > date '1995-03-03'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2672254.79..2672254.82 rows=10 width=20) (actual time=33670.575..33670.578 rows=10 loops=1)
   Buffers: shared hit=797692 read=560066 dirtied=1010 written=1028
   ->  Sort  (cost=2672254.79..2680175.70 rows=3168361 width=20) (actual time=33670.572..33670.574 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=797692 read=560066 dirtied=1010 written=1028
         ->  HashAggregate  (cost=2572104.04..2603787.65 rows=3168361 width=20) (actual time=33589.478..33651.486 rows=114092 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=797686 read=560066 dirtied=1010 written=1028
               ->  Hash Join  (cost=551401.10..2524578.63 rows=3168361 width=20) (actual time=9501.626..33266.627 rows=301900 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=797686 read=560066 dirtied=1010 written=1028
                     ->  Seq Scan on lineitem  (cost=0.00..1818865.35 rows=32700952 width=12) (actual time=0.033..17013.537 rows=32666207 loops=1)
                           Filter: (l_shipdate > '1995-03-03'::date)
                           Rows Removed by Filter: 27379396
                           Buffers: shared hit=551836 read=515710 dirtied=1010 written=997
                     ->  Hash  (cost=533198.12..533198.12 rows=1456238 width=12) (actual time=9447.971..9447.971 rows=1448266 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 78615kB
                           Buffers: shared hit=245850 read=44356 written=31
                           ->  Hash Join  (cost=49784.60..533198.12 rows=1456238 width=12) (actual time=728.018..8892.128 rows=1448266 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=245850 read=44356 written=31
                                 ->  Seq Scan on orders  (cost=0.00..441649.60 rows=7253745 width=16) (actual time=0.043..4342.167 rows=7221694 loops=1)
                                       Filter: (o_orderdate < '1995-03-03'::date)
                                       Rows Removed by Filter: 7793306
                                       Buffers: shared hit=245848 read=7927
                                 ->  Hash  (cost=46020.41..46020.41 rows=301135 width=4) (actual time=723.217..723.217 rows=300276 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14653kB
                                       Buffers: shared hit=2 read=36429 written=31
                                       ->  Bitmap Heap Scan on customer  (cost=6978.22..46020.41 rows=301135 width=4) (actual time=64.549..613.811 rows=300276 loops=1)
                                             Recheck Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                             Heap Blocks: exact=35277
                                             Buffers: shared hit=2 read=36429 written=31
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6902.94 rows=301135 width=0) (actual time=56.704..56.704 rows=300276 loops=1)
                                                   Index Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                                   Buffers: shared read=1154
 Planning time: 3.259 ms
 Execution time: 33702.019 ms
(38 rows)

COMMIT;
COMMIT