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 '1995-03-19'
	and l_shipdate > date '1995-03-19'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2698122.51..2698122.54 rows=10 width=20) (actual time=41132.797..41132.802 rows=10 loops=1)
   Buffers: shared hit=703480 read=667451 written=121
   ->  Sort  (cost=2698122.51..2706138.23 rows=3206285 width=20) (actual time=41132.790..41132.792 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=703480 read=667451 written=121
         ->  HashAggregate  (cost=2596773.00..2628835.85 rows=3206285 width=20) (actual time=41029.584..41110.988 rows=113323 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=703474 read=667451 written=121
               ->  Hash Join  (cost=557088.88..2548678.72 rows=3206285 width=20) (actual time=10279.955..38213.056 rows=300208 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=703474 read=667451 written=121
                     ->  Seq Scan on lineitem  (cost=0.00..1837000.04 rows=32673856 width=12) (actual time=0.053..20068.272 rows=32264690 loops=1)
                           Filter: (l_shipdate > '1995-03-19'::date)
                           Rows Removed by Filter: 27780304
                           Buffers: shared hit=522031 read=556157 written=4
                     ->  Hash  (cost=538468.80..538468.80 rows=1489606 width=12) (actual time=10261.399..10261.399 rows=1464055 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 79293kB
                           Buffers: shared hit=181443 read=111294 written=117
                           ->  Hash Join  (cost=49885.86..538468.80 rows=1489606 width=12) (actual time=850.171..9606.666 rows=1464055 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=181443 read=111294 written=117
                                 ->  Seq Scan on orders  (cost=0.00..446056.09 rows=7368210 width=16) (actual time=0.025..5491.567 rows=7322162 loops=1)
                                       Filter: (o_orderdate < '1995-03-19'::date)
                                       Rows Removed by Filter: 7692838
                                       Buffers: shared hit=181441 read=74866 written=82
                                 ->  Hash  (cost=46095.24..46095.24 rows=303250 width=4) (actual time=846.347..846.347 rows=300441 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14659kB
                                       Buffers: shared hit=2 read=36428 written=35
                                       ->  Bitmap Heap Scan on customer  (cost=7026.61..46095.24 rows=303250 width=4) (actual time=79.329..739.378 rows=300441 loops=1)
                                             Recheck Cond: (c_mktsegment = 'MACHINERY'::bpchar)
                                             Heap Blocks: exact=35276
                                             Buffers: shared hit=2 read=36428 written=35
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6950.80 rows=303250 width=0) (actual time=69.678..69.678 rows=300441 loops=1)
                                                   Index Cond: (c_mktsegment = 'MACHINERY'::bpchar)
                                                   Buffers: shared read=1154 written=5
 Planning time: 4.485 ms
 Execution time: 41160.864 ms
(38 rows)

COMMIT;
COMMIT