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 '1995-03-03'
	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=2776372.40..2776372.43 rows=10 width=20) (actual time=82752.338..82752.343 rows=10 loops=1)
   Buffers: shared hit=878049 read=496831 written=867
   ->  Sort  (cost=2776372.40..2784293.92 rows=3168607 width=20) (actual time=82752.332..82752.336 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=878049 read=496831 written=867
         ->  HashAggregate  (cost=2676213.87..2707899.94 rows=3168607 width=20) (actual time=82624.469..82718.719 rows=113568 loops=1)
               Buffers: shared hit=878043 read=496831 written=867
               ->  Hash Join  (cost=630435.31..2628684.77 rows=3168607 width=20) (actual time=26104.285..82100.214 rows=299174 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=878043 read=496831 written=867
                     ->  Seq Scan on lineitem  (cost=0.00..1842448.62 rows=33097269 width=12) (actual time=0.046..31565.747 rows=32665332 loops=1)
                           Filter: (l_shipdate > '1995-03-03'::date)
                           Rows Removed by Filter: 27379461
                           Buffers: shared hit=586435 read=494947 written=867
                     ->  Hash  (cost=612215.66..612215.66 rows=1457572 width=12) (actual time=26102.253..26102.253 rows=1444755 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 62080kB
                           Buffers: shared hit=291608 read=1884
                           ->  Hash Join  (cost=49674.31..612215.66 rows=1457572 width=12) (actual time=967.975..24550.064 rows=1444755 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=291608 read=1884
                                 ->  Seq Scan on orders  (cost=0.00..447376.99 rows=7315538 width=16) (actual time=0.014..6493.692 rows=7221794 loops=1)
                                       Filter: (o_orderdate < '1995-03-03'::date)
                                       Rows Removed by Filter: 7793206
                                       Buffers: shared hit=256333 read=733
                                 ->  Hash  (cost=45938.50..45938.50 rows=298865 width=4) (actual time=967.773..967.773 rows=299496 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10530kB
                                       Buffers: shared hit=35275 read=1151
                                       ->  Bitmap Heap Scan on customer  (cost=6924.68..45938.50 rows=298865 width=4) (actual time=180.355..797.185 rows=299496 loops=1)
                                             Recheck Cond: (c_mktsegment = 'FURNITURE'::bpchar)
                                             Buffers: shared hit=35275 read=1151
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6849.97 rows=298865 width=0) (actual time=167.784..167.784 rows=299496 loops=1)
                                                   Index Cond: (c_mktsegment = 'FURNITURE'::bpchar)
                                                   Buffers: shared read=1151
 Total runtime: 82800.469 ms
(35 rows)

COMMIT;
COMMIT