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 = 'MACHINERY'
	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=2690021.97..2690022.00 rows=10 width=20) (actual time=36540.483..36540.489 rows=10 loops=1)
   Buffers: shared hit=791389 read=575571 dirtied=128 written=3463
   ->  Sort  (cost=2690021.97..2698010.20 rows=3195291 width=20) (actual time=36540.480..36540.483 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=791389 read=575571 dirtied=128 written=3463
         ->  HashAggregate  (cost=2589019.97..2620972.88 rows=3195291 width=20) (actual time=36461.140..36519.328 rows=113282 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=791383 read=575571 dirtied=128 written=3463
               ->  Hash Join  (cost=555670.39..2541090.61 rows=3195291 width=20) (actual time=10848.641..36189.800 rows=299849 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=791383 read=575571 dirtied=128 written=3463
                     ->  Seq Scan on lineitem  (cost=0.00..1831527.48 rows=32517289 width=12) (actual time=0.041..19523.862 rows=32181363 loops=1)
                           Filter: (l_shipdate > '1995-03-21'::date)
                           Rows Removed by Filter: 27802559
                           Buffers: shared hit=616630 read=458346
                     ->  Hash  (cost=537080.03..537080.03 rows=1487229 width=12) (actual time=10833.616..10833.616 rows=1465094 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 79338kB
                           Buffers: shared hit=174753 read=117225 dirtied=128 written=3463
                           ->  Hash Join  (cost=49885.86..537080.03 rows=1487229 width=12) (actual time=1560.680..10234.939 rows=1465094 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=174753 read=117225 dirtied=128 written=3463
                                 ->  Seq Scan on orders  (cost=0.00..444735.19 rows=7356449 width=16) (actual time=0.033..5326.791 rows=7327484 loops=1)
                                       Filter: (o_orderdate < '1995-03-21'::date)
                                       Rows Removed by Filter: 7672516
                                       Buffers: shared hit=174751 read=80797 dirtied=128 written=3409
                                 ->  Hash  (cost=46095.24..46095.24 rows=303250 width=4) (actual time=873.250..873.250 rows=300441 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14659kB
                                       Buffers: shared hit=2 read=36428 written=54
                                       ->  Bitmap Heap Scan on customer  (cost=7026.61..46095.24 rows=303250 width=4) (actual time=80.643..762.817 rows=300441 loops=1)
                                             Recheck Cond: (c_mktsegment = 'MACHINERY'::bpchar)
                                             Heap Blocks: exact=35276
                                             Buffers: shared hit=2 read=36428 written=54
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6950.80 rows=303250 width=0) (actual time=70.992..70.992 rows=300441 loops=1)
                                                   Index Cond: (c_mktsegment = 'MACHINERY'::bpchar)
                                                   Buffers: shared read=1154
 Planning time: 5.834 ms
 Execution time: 36574.827 ms
(38 rows)

COMMIT;
COMMIT