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 '1995-03-21'
	and l_shipdate > date '1995-03-21'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2669629.04..2669629.06 rows=10 width=20) (actual time=30293.285..30293.290 rows=10 loops=1)
   Buffers: shared hit=804554 read=551876
   ->  Sort  (cost=2669629.04..2677562.78 rows=3173495 width=20) (actual time=30293.280..30293.282 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=804554 read=551876
         ->  HashAggregate  (cost=2569316.00..2601050.95 rows=3173495 width=20) (actual time=30237.354..30274.289 rows=113845 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=804548 read=551876
               ->  Hash Join  (cost=551659.16..2521713.58 rows=3173495 width=20) (actual time=7717.590..30019.578 rows=300246 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=804548 read=551876
                     ->  Seq Scan on lineitem  (cost=0.00..1817046.11 rows=32339562 width=12) (actual time=0.034..17827.652 rows=32215897 loops=1)
                           Filter: (l_shipdate > '1995-03-21'::date)
                           Rows Removed by Filter: 27829772
                           Buffers: shared hit=515751 read=550724
                     ->  Hash  (cost=533241.32..533241.32 rows=1473427 width=12) (actual time=7709.418..7709.418 rows=1466679 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 79406kB
                           Buffers: shared hit=288797 read=1152
                           ->  Hash Join  (cost=49796.13..533241.32 rows=1473427 width=12) (actual time=469.707..7269.514 rows=1466679 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=288797 read=1152
                                 ->  Seq Scan on orders  (cost=0.00..441209.30 rows=7333765 width=16) (actual time=0.018..4844.701 rows=7334454 loops=1)
                                       Filter: (o_orderdate < '1995-03-21'::date)
                                       Rows Removed by Filter: 7680546
                                       Buffers: shared hit=253522
                                 ->  Hash  (cost=46029.07..46029.07 rows=301365 width=4) (actual time=467.226..467.226 rows=300036 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14645kB
                                       Buffers: shared hit=35275 read=1152
                                       ->  Bitmap Heap Scan on customer  (cost=6984.01..46029.07 rows=301365 width=4) (actual time=68.201..391.730 rows=300036 loops=1)
                                             Recheck Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=35275 read=1152
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6908.66 rows=301365 width=0) (actual time=59.777..59.777 rows=300036 loops=1)
                                                   Index Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                                   Buffers: shared read=1152
 Planning time: 4.510 ms
 Execution time: 30313.175 ms
(38 rows)

COMMIT;
COMMIT