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 '1995-03-02'
	and l_shipdate > date '1995-03-02'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2683469.02..2683469.05 rows=10 width=20) (actual time=35745.988..35745.991 rows=10 loops=1)
   Buffers: shared hit=731393 read=632935 dirtied=887 written=672
   ->  Sort  (cost=2683469.02..2691365.84 rows=3158728 width=20) (actual time=35745.985..35745.986 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=731393 read=632935 dirtied=887 written=672
         ->  HashAggregate  (cost=2583622.77..2615210.05 rows=3158728 width=20) (actual time=35655.365..35725.361 rows=113602 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=731387 read=632935 dirtied=887 written=672
               ->  Hash Join  (cost=553508.05..2536241.85 rows=3158728 width=20) (actual time=9812.618..35388.838 rows=299174 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=731387 read=632935 dirtied=887 written=672
                     ->  Seq Scan on lineitem  (cost=0.00..1827919.74 rows=32860475 width=12) (actual time=0.054..18569.496 rows=32690822 loops=1)
                           Filter: (l_shipdate > '1995-03-02'::date)
                           Rows Removed by Filter: 27354488
                           Buffers: shared hit=563965 read=508891 dirtied=887 written=672
                     ->  Hash  (cost=535358.42..535358.42 rows=1451970 width=12) (actual time=9795.329..9795.329 rows=1443577 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 78413kB
                           Buffers: shared hit=167422 read=124044
                           ->  Hash Join  (cost=49689.56..535358.42 rows=1451970 width=12) (actual time=891.034..9131.797 rows=1443577 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=167422 read=124044
                                 ->  Seq Scan on orders  (cost=0.00..443852.85 rows=7279018 width=16) (actual time=0.027..5170.106 rows=7215395 loops=1)
                                       Filter: (o_orderdate < '1995-03-02'::date)
                                       Rows Removed by Filter: 7799605
                                       Buffers: shared hit=167420 read=87621
                                 ->  Hash  (cost=45949.43..45949.43 rows=299210 width=4) (actual time=887.099..887.099 rows=299496 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14626kB
                                       Buffers: shared hit=2 read=36423
                                       ->  Bitmap Heap Scan on customer  (cost=6931.30..45949.43 rows=299210 width=4) (actual time=77.758..770.722 rows=299496 loops=1)
                                             Recheck Cond: (c_mktsegment = 'FURNITURE'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=2 read=36423
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6856.50 rows=299210 width=0) (actual time=68.643..68.643 rows=299496 loops=1)
                                                   Index Cond: (c_mktsegment = 'FURNITURE'::bpchar)
                                                   Buffers: shared read=1150
 Planning time: 4.420 ms
 Execution time: 35774.248 ms
(38 rows)

COMMIT;
COMMIT