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 = 'FURNITURE'
	and c_custkey = o_custkey
	and l_orderkey = o_orderkey
	and o_orderdate < date '1995-03-16'
	and l_shipdate > date '1995-03-16'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2686336.89..2686336.91 rows=10 width=20) (actual time=33557.439..33557.443 rows=10 loops=1)
   Buffers: shared hit=998578 read=367066 dirtied=1 written=45
   ->  Sort  (cost=2686336.89..2694266.93 rows=3172019 width=20) (actual time=33557.436..33557.437 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=998578 read=367066 dirtied=1 written=45
         ->  HashAggregate  (cost=2586070.50..2617790.69 rows=3172019 width=20) (actual time=33475.902..33535.663 rows=113437 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=998572 read=367066 dirtied=1 written=45
               ->  Hash Join  (cost=554597.52..2538490.22 rows=3172019 width=20) (actual time=8409.829..33210.646 rows=298913 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=998572 read=367066 dirtied=1 written=45
                     ->  Seq Scan on lineitem  (cost=0.00..1829722.15 rows=32653430 width=12) (actual time=0.053..18353.374 rows=32339464 loops=1)
                           Filter: (l_shipdate > '1995-03-16'::date)
                           Rows Removed by Filter: 27705200
                           Buffers: shared hit=746050 read=327868
                     ->  Hash  (cost=536237.69..536237.69 rows=1468786 width=12) (actual time=8393.523..8393.523 rows=1461161 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 79169kB
                           Buffers: shared hit=252522 read=39198 dirtied=1 written=45
                           ->  Hash Join  (cost=49740.43..536237.69 rows=1468786 width=12) (actual time=837.175..7870.024 rows=1461161 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=252522 read=39198 dirtied=1 written=45
                                 ->  Seq Scan on orders  (cost=0.00..444294.89 rows=7337203 width=16) (actual time=0.022..4634.801 rows=7303376 loops=1)
                                       Filter: (o_orderdate < '1995-03-16'::date)
                                       Rows Removed by Filter: 7711624
                                       Buffers: shared hit=252515 read=2780 dirtied=1 written=3
                                 ->  Hash  (cost=45987.00..45987.00 rows=300275 width=4) (actual time=833.099..833.099 rows=299496 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14626kB
                                       Buffers: shared hit=7 read=36418 written=42
                                       ->  Bitmap Heap Scan on customer  (cost=6955.56..45987.00 rows=300275 width=4) (actual time=76.989..737.689 rows=299496 loops=1)
                                             Recheck Cond: (c_mktsegment = 'FURNITURE'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=7 read=36418 written=42
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6880.49 rows=300275 width=0) (actual time=68.038..68.038 rows=299496 loops=1)
                                                   Index Cond: (c_mktsegment = 'FURNITURE'::bpchar)
                                                   Buffers: shared read=1150 written=4
 Planning time: 4.212 ms
 Execution time: 33595.836 ms
(38 rows)

COMMIT;
COMMIT