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 '1995-03-09'
	and l_shipdate > date '1995-03-09'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2687267.99..2687268.02 rows=10 width=20) (actual time=29184.974..29184.977 rows=10 loops=1)
   Buffers: shared hit=817800 read=549157 written=55
   ->  Sort  (cost=2687267.99..2695139.39 rows=3148558 width=20) (actual time=29184.970..29184.972 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=817800 read=549157 written=55
         ->  HashAggregate  (cost=2587743.21..2619228.79 rows=3148558 width=20) (actual time=29127.930..29165.891 rows=113854 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=817794 read=549157 written=55
               ->  Hash Join  (cost=554435.75..2540514.84 rows=3148558 width=20) (actual time=7378.841..28897.700 rows=300697 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=817794 read=549157 written=55
                     ->  Seq Scan on lineitem  (cost=0.00..1831531.51 rows=32816533 width=12) (actual time=0.028..16701.428 rows=32481593 loops=1)
                           Filter: (l_shipdate > '1995-03-09'::date)
                           Rows Removed by Filter: 27502329
                           Buffers: shared hit=592773 read=482203
                     ->  Hash  (cost=536284.32..536284.32 rows=1452114 width=12) (actual time=7366.909..7366.909 rows=1450369 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 78705kB
                           Buffers: shared hit=225021 read=66954 written=55
                           ->  Hash Join  (cost=49648.90..536284.32 rows=1452114 width=12) (actual time=650.698..6893.746 rows=1450369 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=225021 read=66954 written=55
                                 ->  Seq Scan on orders  (cost=0.00..444735.19 rows=7301092 width=16) (actual time=0.015..4109.838 rows=7252522 loops=1)
                                       Filter: (o_orderdate < '1995-03-09'::date)
                                       Rows Removed by Filter: 7747478
                                       Buffers: shared hit=225019 read=30529
                                 ->  Hash  (cost=45919.71..45919.71 rows=298335 width=4) (actual time=647.834..647.834 rows=300036 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14645kB
                                       Buffers: shared hit=2 read=36425 written=55
                                       ->  Bitmap Heap Scan on customer  (cost=6912.52..45919.71 rows=298335 width=4) (actual time=61.235..558.387 rows=300036 loops=1)
                                             Recheck Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=2 read=36425 written=55
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6837.94 rows=298335 width=0) (actual time=53.733..53.733 rows=300036 loops=1)
                                                   Index Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                                   Buffers: shared read=1152
 Planning time: 3.594 ms
 Execution time: 29461.920 ms
(38 rows)

COMMIT;
COMMIT