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 '1995-03-23'
	and l_shipdate > date '1995-03-23'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2697249.65..2697249.67 rows=10 width=20) (actual time=32983.472..32983.475 rows=10 loops=1)
   Buffers: shared hit=805471 read=565893 written=6949
   ->  Sort  (cost=2697249.65..2705209.59 rows=3183977 width=20) (actual time=32983.468..32983.469 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=805471 read=565893 written=6949
         ->  HashAggregate  (cost=2596605.28..2628445.05 rows=3183977 width=20) (actual time=32913.638..32962.435 rows=113680 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=805465 read=565893 written=6949
               ->  Hash Join  (cost=556875.53..2548845.62 rows=3183977 width=20) (actual time=9506.842..32671.024 rows=299913 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=805465 read=565893 written=6949
                     ->  Seq Scan on lineitem  (cost=0.00..1837740.15 rows=32637381 width=12) (actual time=0.032..17926.173 rows=32132362 loops=1)
                           Filter: (l_shipdate > '1995-03-23'::date)
                           Rows Removed by Filter: 27852490
                           Buffers: shared hit=663119 read=415505
                     ->  Hash  (cost=538364.34..538364.34 rows=1480895 width=12) (actual time=9492.464..9492.464 rows=1467767 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 79453kB
                           Buffers: shared hit=142346 read=150388 written=6949
                           ->  Hash Join  (cost=49724.64..538364.34 rows=1480895 width=12) (actual time=827.675..8932.818 rows=1467767 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=142346 read=150388 written=6949
                                 ->  Seq Scan on orders  (cost=0.00..446056.09 rows=7406575 width=16) (actual time=0.024..5590.419 rows=7339881 loops=1)
                                       Filter: (o_orderdate < '1995-03-23'::date)
                                       Rows Removed by Filter: 7660119
                                       Buffers: shared hit=142344 read=113963 written=4600
                                 ->  Hash  (cost=45975.71..45975.71 rows=299915 width=4) (actual time=824.119..824.119 rows=300036 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14645kB
                                       Buffers: shared hit=2 read=36425 written=2349
                                       ->  Bitmap Heap Scan on customer  (cost=6948.77..45975.71 rows=299915 width=4) (actual time=77.694..727.485 rows=300036 loops=1)
                                             Recheck Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=2 read=36425 written=2349
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6873.79 rows=299915 width=0) (actual time=68.741..68.741 rows=300036 loops=1)
                                                   Index Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                                   Buffers: shared read=1152 written=89
 Planning time: 4.099 ms
 Execution time: 33007.902 ms
(38 rows)

COMMIT;
COMMIT