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 '1995-03-17'
	and l_shipdate > date '1995-03-17'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2688017.12..2688017.14 rows=10 width=20) (actual time=33521.593..33521.596 rows=10 loops=1)
   Buffers: shared hit=948662 read=416984 dirtied=45 written=33
   ->  Sort  (cost=2688017.12..2696003.29 rows=3194469 width=20) (actual time=33521.590..33521.590 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=948662 read=416984 dirtied=45 written=33
         ->  HashAggregate  (cost=2587041.10..2618985.79 rows=3194469 width=20) (actual time=33440.355..33500.095 rows=113932 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=948656 read=416984 dirtied=45 written=33
               ->  Hash Join  (cost=554961.85..2539124.07 rows=3194469 width=20) (actual time=8924.802..33183.609 rows=300490 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=948656 read=416984 dirtied=45 written=33
                     ->  Seq Scan on lineitem  (cost=0.00..1829727.39 rows=32664037 width=12) (actual time=0.080..18827.786 rows=32314344 loops=1)
                           Filter: (l_shipdate > '1995-03-17'::date)
                           Rows Removed by Filter: 27730320
                           Buffers: shared hit=733328 read=340590 dirtied=45 written=2
                     ->  Hash  (cost=536478.09..536478.09 rows=1478701 width=12) (actual time=8913.415..8913.415 rows=1461876 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 79199kB
                           Buffers: shared hit=215328 read=76394 written=31
                           ->  Hash Join  (cost=49796.13..536478.09 rows=1478701 width=12) (actual time=718.211..8360.217 rows=1461876 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=215328 read=76394 written=31
                                 ->  Seq Scan on orders  (cost=0.00..444294.89 rows=7360016 width=16) (actual time=0.024..5121.560 rows=7309738 loops=1)
                                       Filter: (o_orderdate < '1995-03-17'::date)
                                       Rows Removed by Filter: 7705262
                                       Buffers: shared hit=201764 read=53531 written=26
                                 ->  Hash  (cost=46029.07..46029.07 rows=301365 width=4) (actual time=715.127..715.127 rows=300036 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14645kB
                                       Buffers: shared hit=13564 read=22863 written=5
                                       ->  Bitmap Heap Scan on customer  (cost=6984.01..46029.07 rows=301365 width=4) (actual time=77.279..621.652 rows=300036 loops=1)
                                             Recheck Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=13564 read=22863 written=5
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6908.66 rows=301365 width=0) (actual time=67.993..67.993 rows=300036 loops=1)
                                                   Index Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                                   Buffers: shared read=1152
 Planning time: 3.602 ms
 Execution time: 33547.690 ms
(38 rows)

COMMIT;
COMMIT