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 '1995-03-20'
	and l_shipdate > date '1995-03-20'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2699598.47..2699598.49 rows=10 width=20) (actual time=33240.918..33240.922 rows=10 loops=1)
   Buffers: shared hit=1042512 read=329747 written=44
   ->  Sort  (cost=2699598.47..2707579.79 rows=3192530 width=20) (actual time=33240.916..33240.918 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=1042512 read=329747 written=44
         ->  HashAggregate  (cost=2598683.74..2630609.04 rows=3192530 width=20) (actual time=33173.803..33219.850 rows=114179 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=1042506 read=329747 written=44
               ->  Hash Join  (cost=557356.83..2550795.79 rows=3192530 width=20) (actual time=9019.210..32936.441 rows=302034 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=1042506 read=329747 written=44
                     ->  Seq Scan on lineitem  (cost=0.00..1838827.16 rows=32716399 width=12) (actual time=0.037..17642.664 rows=32239322 loops=1)
                           Filter: (l_shipdate > '1995-03-20'::date)
                           Rows Removed by Filter: 27805975
                           Buffers: shared hit=811212 read=268050 written=3
                     ->  Hash  (cost=538822.47..538822.47 rows=1482749 width=12) (actual time=9004.548..9004.548 rows=1469536 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 79529kB
                           Buffers: shared hit=231294 read=61697 written=41
                           ->  Hash Join  (cost=49762.68..538822.47 rows=1482749 width=12) (actual time=754.551..8406.064 rows=1469536 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=231294 read=61697 written=41
                                 ->  Seq Scan on orders  (cost=0.00..446496.39 rows=7396243 width=16) (actual time=0.023..4649.670 rows=7328465 loops=1)
                                       Filter: (o_orderdate < '1995-03-20'::date)
                                       Rows Removed by Filter: 7686535
                                       Buffers: shared hit=231292 read=25268
                                 ->  Hash  (cost=46003.81..46003.81 rows=300710 width=4) (actual time=751.077..751.077 rows=300276 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14653kB
                                       Buffers: shared hit=2 read=36429 written=41
                                       ->  Bitmap Heap Scan on customer  (cost=6966.93..46003.81 rows=300710 width=4) (actual time=70.189..648.563 rows=300276 loops=1)
                                             Recheck Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                             Heap Blocks: exact=35277
                                             Buffers: shared hit=2 read=36429 written=41
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6891.75 rows=300710 width=0) (actual time=61.447..61.447 rows=300276 loops=1)
                                                   Index Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                                   Buffers: shared read=1154
 Planning time: 3.817 ms
 Execution time: 33265.597 ms
(38 rows)

COMMIT;
COMMIT