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 '1995-03-15'
	and l_shipdate > date '1995-03-15'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                              QUERY PLAN                                                                                               
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2685219.68..2685219.70 rows=10 width=20) (actual time=35045.150..35045.152 rows=10 loops=1)
   Buffers: shared hit=851174 read=514472 written=81
   ->  Sort  (cost=2685219.68..2693113.70 rows=3157608 width=20) (actual time=35045.146..35045.146 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=851174 read=514472 written=81
         ->  HashAggregate  (cost=2585408.83..2616984.91 rows=3157608 width=20) (actual time=34972.403..35023.649 rows=113933 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=851168 read=514472 written=81
               ->  Hash Join  (cost=554369.21..2538044.71 rows=3157608 width=20) (actual time=9595.757..34612.966 rows=300618 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=851168 read=514472 written=81
                     ->  Seq Scan on lineitem  (cost=0.00..1829724.88 rows=32633211 width=12) (actual time=0.033..19103.452 rows=32364470 loops=1)
                           Filter: (l_shipdate > '1995-03-15'::date)
                           Rows Removed by Filter: 27680194
                           Buffers: shared hit=633091 read=440827
                     ->  Hash  (cost=536081.47..536081.47 rows=1463019 width=12) (actual time=9581.155..9581.155 rows=1459339 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 79090kB
                           Buffers: shared hit=218077 read=73645 written=81
                           ->  Hash Join  (cost=49728.90..536081.47 rows=1463019 width=12) (actual time=694.128..8938.871 rows=1459339 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=218077 read=73645 written=81
                                 ->  Seq Scan on orders  (cost=0.00..444294.89 rows=7313998 width=16) (actual time=0.032..5522.314 rows=7297103 loops=1)
                                       Filter: (o_orderdate < '1995-03-15'::date)
                                       Rows Removed by Filter: 7717897
                                       Buffers: shared hit=182835 read=72460 written=73
                                 ->  Hash  (cost=45978.34..45978.34 rows=300045 width=4) (actual time=690.601..690.601 rows=300036 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14645kB
                                       Buffers: shared hit=35242 read=1185 written=8
                                       ->  Bitmap Heap Scan on customer  (cost=6949.78..45978.34 rows=300045 width=4) (actual time=113.876..561.783 rows=300036 loops=1)
                                             Recheck Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=35242 read=1185 written=8
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6874.76 rows=300045 width=0) (actual time=101.442..101.442 rows=300036 loops=1)
                                                   Index Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                                   Buffers: shared read=1152 written=8
 Planning time: 5.238 ms
 Execution time: 35074.578 ms
(38 rows)

COMMIT;
COMMIT