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 '1995-03-28'
	and l_shipdate > date '1995-03-28'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                              QUERY PLAN                                                                                               
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2757838.38..2757838.41 rows=10 width=20) (actual time=86193.900..86193.904 rows=10 loops=1)
   Buffers: shared hit=999304 read=365027 written=179
   ->  Sort  (cost=2757838.38..2765786.28 rows=3179159 width=20) (actual time=86193.895..86193.896 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=999304 read=365027 written=179
         ->  HashAggregate  (cost=2657346.31..2689137.90 rows=3179159 width=20) (actual time=86097.831..86171.638 rows=113639 loops=1)
               Buffers: shared hit=999298 read=365027 written=179
               ->  Hash Join  (cost=629190.87..2609658.92 rows=3179159 width=20) (actual time=25855.129..85566.330 rows=300004 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=999298 read=365027 written=179
                     ->  Seq Scan on lineitem  (cost=0.00..1827915.35 rows=32202964 width=12) (actual time=0.056..34320.180 rows=32040231 loops=1)
                           Filter: (l_shipdate > '1995-03-28'::date)
                           Rows Removed by Filter: 28005079
                           Buffers: shared hit=709182 read=363674
                     ->  Hash  (cost=610550.88..610550.88 rows=1491199 width=12) (actual time=25851.774..25851.774 rows=1475460 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 63399kB
                           Buffers: shared hit=290116 read=1353 written=179
                           ->  Hash Join  (cost=49803.23..610550.88 rows=1491199 width=12) (actual time=694.553..25069.221 rows=1475460 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=290116 read=1353 written=179
                                 ->  Seq Scan on orders  (cost=0.00..443852.85 rows=7416932 width=16) (actual time=0.028..6356.939 rows=7377882 loops=1)
                                       Filter: (o_orderdate < '1995-03-28'::date)
                                       Rows Removed by Filter: 7637118
                                       Buffers: shared hit=254890 read=151 written=8
                                 ->  Hash  (cost=46033.48..46033.48 rows=301580 width=4) (actual time=694.144..694.144 rows=300036 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10549kB
                                       Buffers: shared hit=35226 read=1202 written=171
                                       ->  Bitmap Heap Scan on customer  (cost=6985.73..46033.48 rows=301580 width=4) (actual time=134.496..566.712 rows=300036 loops=1)
                                             Recheck Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                             Buffers: shared hit=35226 read=1202 written=171
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6910.33 rows=301580 width=0) (actual time=121.239..121.239 rows=300036 loops=1)
                                                   Index Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                                   Buffers: shared read=1153 written=166
 Total runtime: 86248.810 ms
(35 rows)

COMMIT;
COMMIT