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=2672481.73..2672481.76 rows=10 width=20) (actual time=31897.239..31897.243 rows=10 loops=1)
   Buffers: shared hit=880474 read=477280
   ->  Sort  (cost=2672481.73..2680421.71 rows=3175989 width=20) (actual time=31897.237..31897.238 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=880474 read=477280
         ->  HashAggregate  (cost=2572089.86..2603849.75 rows=3175989 width=20) (actual time=31828.850..31876.561 rows=113897 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=880468 read=477280
               ->  Hash Join  (cost=551871.81..2524450.03 rows=3175989 width=20) (actual time=8066.171..31575.460 rows=300543 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=880468 read=477280
                     ->  Seq Scan on lineitem  (cost=0.00..1818870.86 rows=32519323 width=12) (actual time=0.025..18041.129 rows=32365888 loops=1)
                           Filter: (l_shipdate > '1995-03-15'::date)
                           Rows Removed by Filter: 27679715
                           Buffers: shared hit=616500 read=451046
                     ->  Hash  (cost=533523.10..533523.10 rows=1467897 width=12) (actual time=8053.367..8053.367 rows=1459209 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 79085kB
                           Buffers: shared hit=263968 read=26234
                           ->  Hash Join  (cost=49796.13..533523.10 rows=1467897 width=12) (actual time=469.816..7523.147 rows=1459209 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=263968 read=26234
                                 ->  Seq Scan on orders  (cost=0.00..441649.60 rows=7306240 width=16) (actual time=0.027..4575.213 rows=7296925 loops=1)
                                       Filter: (o_orderdate < '1995-03-15'::date)
                                       Rows Removed by Filter: 7718075
                                       Buffers: shared hit=228694 read=25081
                                 ->  Hash  (cost=46029.07..46029.07 rows=301365 width=4) (actual time=466.822..466.822 rows=300036 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14645kB
                                       Buffers: shared hit=35274 read=1153
                                       ->  Bitmap Heap Scan on customer  (cost=6984.01..46029.07 rows=301365 width=4) (actual time=73.365..378.436 rows=300036 loops=1)
                                             Recheck Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=35274 read=1153
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6908.66 rows=301365 width=0) (actual time=63.859..63.859 rows=300036 loops=1)
                                                   Index Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                                   Buffers: shared read=1152
 Planning time: 3.590 ms
 Execution time: 31929.209 ms
(38 rows)

COMMIT;
COMMIT