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 '1995-03-29'
	and l_shipdate > date '1995-03-29'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2683004.02..2683004.05 rows=10 width=20) (actual time=33522.624..33522.629 rows=10 loops=1)
   Buffers: shared hit=944269 read=420061 written=58
   ->  Sort  (cost=2683004.02..2690922.80 rows=3167513 width=20) (actual time=33522.622..33522.622 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=944269 read=420061 written=58
         ->  HashAggregate  (cost=2582880.08..2614555.21 rows=3167513 width=20) (actual time=33456.080..33501.879 rows=113503 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=944263 read=420061 written=58
               ->  Hash Join  (cost=554721.87..2535367.38 rows=3167513 width=20) (actual time=9308.651..33206.735 rows=299689 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=944263 read=420061 written=58
                     ->  Seq Scan on lineitem  (cost=0.00..1827912.74 rows=32282039 width=12) (actual time=0.049..18624.629 rows=32015284 loops=1)
                           Filter: (l_shipdate > '1995-03-29'::date)
                           Rows Removed by Filter: 28030026
                           Buffers: shared hit=802884 read=269972
                     ->  Hash  (cost=536195.65..536195.65 rows=1482097 width=12) (actual time=9291.979..9291.979 rows=1476638 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 79834kB
                           Buffers: shared hit=141379 read=150089 written=58
                           ->  Hash Join  (cost=49724.64..536195.65 rows=1482097 width=12) (actual time=846.221..8728.613 rows=1476638 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=141379 read=150089 written=58
                                 ->  Seq Scan on orders  (cost=0.00..443852.85 rows=7412584 width=16) (actual time=0.023..5400.507 rows=7384106 loops=1)
                                       Filter: (o_orderdate < '1995-03-29'::date)
                                       Rows Removed by Filter: 7630894
                                       Buffers: shared hit=141377 read=113664 written=42
                                 ->  Hash  (cost=45975.71..45975.71 rows=299915 width=4) (actual time=842.040..842.040 rows=300036 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14645kB
                                       Buffers: shared hit=2 read=36425 written=16
                                       ->  Bitmap Heap Scan on customer  (cost=6948.77..45975.71 rows=299915 width=4) (actual time=75.212..744.945 rows=300036 loops=1)
                                             Recheck Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=2 read=36425 written=16
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6873.79 rows=299915 width=0) (actual time=66.455..66.455 rows=300036 loops=1)
                                                   Index Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                                   Buffers: shared read=1152
 Planning time: 4.161 ms
 Execution time: 33561.200 ms
(38 rows)

COMMIT;
COMMIT