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 '1995-03-26'
	and l_shipdate > date '1995-03-26'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2689679.06..2689679.09 rows=10 width=20) (actual time=34016.491..34016.496 rows=10 loops=1)
   Buffers: shared hit=855413 read=511547 written=6
   ->  Sort  (cost=2689679.06..2697661.44 rows=3192952 width=20) (actual time=34016.487..34016.488 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=855413 read=511547 written=6
         ->  HashAggregate  (cost=2588751.00..2620680.52 rows=3192952 width=20) (actual time=33935.294..33996.036 rows=113528 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=855407 read=511547 written=6
               ->  Hash Join  (cost=555935.64..2540856.72 rows=3192952 width=20) (actual time=9003.774..33676.287 rows=300568 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=855407 read=511547 written=6
                     ->  Seq Scan on lineitem  (cost=0.00..1831531.31 rows=32389399 width=12) (actual time=0.079..18633.853 rows=32089115 loops=1)
                           Filter: (l_shipdate > '1995-03-26'::date)
                           Rows Removed by Filter: 27954967
                           Buffers: shared hit=563429 read=511547 written=6
                     ->  Hash  (cost=537285.54..537285.54 rows=1492008 width=12) (actual time=8991.895..8991.895 rows=1472847 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 79671kB
                           Buffers: shared hit=291978
                           ->  Hash Join  (cost=49803.99..537285.54 rows=1492008 width=12) (actual time=620.862..8445.687 rows=1472847 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=291978
                                 ->  Seq Scan on orders  (cost=0.00..444735.19 rows=7420342 width=16) (actual time=0.023..4697.340 rows=7365834 loops=1)
                                       Filter: (o_orderdate < '1995-03-26'::date)
                                       Rows Removed by Filter: 7649166
                                       Buffers: shared hit=255548
                                 ->  Hash  (cost=46033.93..46033.93 rows=301605 width=4) (actual time=490.456..490.456 rows=300441 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14659kB
                                       Buffers: shared hit=36430
                                       ->  Bitmap Heap Scan on customer  (cost=6985.87..46033.93 rows=301605 width=4) (actual time=63.501..393.358 rows=300441 loops=1)
                                             Recheck Cond: (c_mktsegment = 'MACHINERY'::bpchar)
                                             Heap Blocks: exact=35276
                                             Buffers: shared hit=36430
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6910.47 rows=301605 width=0) (actual time=54.293..54.293 rows=300441 loops=1)
                                                   Index Cond: (c_mktsegment = 'MACHINERY'::bpchar)
                                                   Buffers: shared hit=1154
 Planning time: 3.855 ms
 Execution time: 34040.501 ms
(38 rows)

COMMIT;
COMMIT