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 '1995-03-17'
	and l_shipdate > date '1995-03-17'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2696782.39..2696782.42 rows=10 width=20) (actual time=38625.014..38625.019 rows=10 loops=1)
   Buffers: shared hit=935221 read=436279 written=817
   ->  Sort  (cost=2696782.39..2704713.62 rows=3172491 width=20) (actual time=38625.010..38625.011 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=935221 read=436279 written=817
         ->  HashAggregate  (cost=2596501.09..2628226.00 rows=3172491 width=20) (actual time=38543.058..38603.444 rows=113816 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=935215 read=436279 written=817
               ->  Hash Join  (cost=556473.66..2548913.73 rows=3172491 width=20) (actual time=9708.294..38247.718 rows=300150 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=935215 read=436279 written=817
                     ->  Seq Scan on lineitem  (cost=0.00..1837974.60 rows=32730814 width=12) (actual time=0.066..21098.096 rows=32282221 loops=1)
                           Filter: (l_shipdate > '1995-03-17'::date)
                           Rows Removed by Filter: 27702631
                           Buffers: shared hit=719385 read=359375
                     ->  Hash  (cost=538081.90..538081.90 rows=1471341 width=12) (actual time=9688.878..9688.878 rows=1460304 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 79132kB
                           Buffers: shared hit=215830 read=76904 written=817
                           ->  Hash Join  (cost=49728.90..538081.90 rows=1471341 width=12) (actual time=561.908..9047.274 rows=1460304 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=215830 read=76904 written=817
                                 ->  Seq Scan on orders  (cost=0.00..446056.09 rows=7355601 width=16) (actual time=0.024..5282.858 rows=7302414 loops=1)
                                       Filter: (o_orderdate < '1995-03-17'::date)
                                       Rows Removed by Filter: 7697586
                                       Buffers: shared hit=181606 read=74701 written=671
                                 ->  Hash  (cost=45978.34..45978.34 rows=300045 width=4) (actual time=557.670..557.670 rows=300036 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14645kB
                                       Buffers: shared hit=34224 read=2203 written=146
                                       ->  Bitmap Heap Scan on customer  (cost=6949.78..45978.34 rows=300045 width=4) (actual time=80.519..450.092 rows=300036 loops=1)
                                             Recheck Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=34224 read=2203 written=146
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6874.76 rows=300045 width=0) (actual time=70.615..70.615 rows=300036 loops=1)
                                                   Index Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                                   Buffers: shared read=1152 written=57
 Planning time: 3.724 ms
 Execution time: 38652.115 ms
(38 rows)

COMMIT;
COMMIT