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 = 'AUTOMOBILE'
	and c_custkey = o_custkey
	and l_orderkey = o_orderkey
	and o_orderdate < date '1995-03-26'
	and l_shipdate > date '1995-03-26'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2745978.79..2745978.82 rows=10 width=20) (actual time=97281.960..97281.965 rows=10 loops=1)
   Buffers: shared hit=819841 read=538733 dirtied=752 written=713
   ->  Sort  (cost=2745978.79..2753892.13 rows=3165336 width=20) (actual time=97281.956..97281.958 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=819841 read=538733 dirtied=752 written=713
         ->  HashAggregate  (cost=2645923.66..2677577.02 rows=3165336 width=20) (actual time=97197.684..97262.105 rows=113541 loops=1)
               Buffers: shared hit=819835 read=538733 dirtied=752 written=713
               ->  Hash Join  (cost=626087.30..2598443.62 rows=3165336 width=20) (actual time=34835.960..96581.963 rows=299868 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=819835 read=538733 dirtied=752 written=713
                     ->  Seq Scan on lineitem  (cost=0.00..1820263.66 rows=32117146 width=12) (actual time=0.082..35678.007 rows=32059021 loops=1)
                           Filter: (l_shipdate > '1995-03-26'::date)
                           Rows Removed by Filter: 27926531
                           Buffers: shared hit=564939 read=503426 dirtied=749 written=192
                     ->  Hash  (cost=607571.14..607571.14 rows=1481293 width=12) (actual time=34833.430..34833.430 rows=1471457 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 63227kB
                           Buffers: shared hit=254896 read=35307 dirtied=3 written=521
                           ->  Hash Join  (cost=49803.23..607571.14 rows=1481293 width=12) (actual time=1237.381..30175.369 rows=1471457 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=254896 read=35307 dirtied=3 written=521
                                 ->  Seq Scan on orders  (cost=0.00..441649.60 rows=7367664 width=16) (actual time=0.016..8247.481 rows=7358162 loops=1)
                                       Filter: (o_orderdate < '1995-03-26'::date)
                                       Rows Removed by Filter: 7641838
                                       Buffers: shared hit=219621 read=34154 dirtied=3 written=521
                                 ->  Hash  (cost=46033.48..46033.48 rows=301580 width=4) (actual time=1237.141..1237.141 rows=300036 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10549kB
                                       Buffers: shared hit=35275 read=1153
                                       ->  Bitmap Heap Scan on customer  (cost=6985.73..46033.48 rows=301580 width=4) (actual time=80.725..518.014 rows=300036 loops=1)
                                             Recheck Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                             Buffers: shared hit=35275 read=1153
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6910.33 rows=301580 width=0) (actual time=70.894..70.894 rows=300036 loops=1)
                                                   Index Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                                   Buffers: shared read=1153
 Total runtime: 98256.178 ms
(35 rows)

COMMIT;
COMMIT