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 '1995-03-13'
	and l_shipdate > date '1995-03-13'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2677626.16..2677626.19 rows=10 width=20) (actual time=46299.849..46299.853 rows=10 loops=1)
   Buffers: shared hit=810556 read=551151 written=19
   ->  Sort  (cost=2677626.16..2685500.26 rows=3149640 width=20) (actual time=46299.845..46299.846 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=810556 read=551151 written=19
         ->  HashAggregate  (cost=2578067.17..2609563.57 rows=3149640 width=20) (actual time=46217.567..46278.236 rows=113881 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=810550 read=551151 written=19
               ->  Hash Join  (cost=552782.28..2530822.57 rows=3149640 width=20) (actual time=13930.225..45870.904 rows=300600 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=810550 read=551151 written=19
                     ->  Seq Scan on lineitem  (cost=0.00..1824310.25 rows=32595637 width=12) (actual time=0.041..22800.692 rows=32416064 loops=1)
                           Filter: (l_shipdate > '1995-03-13'::date)
                           Rows Removed by Filter: 27630157
                           Buffers: shared hit=600161 read=470579 written=4
                     ->  Hash  (cost=534574.11..534574.11 rows=1456654 width=12) (actual time=13914.137..13914.137 rows=1456779 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 78980kB
                           Buffers: shared hit=210389 read=80572 written=15
                           ->  Hash Join  (cost=49728.90..534574.11 rows=1456654 width=12) (actual time=1123.055..13029.781 rows=1456779 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=210389 read=80572 written=15
                                 ->  Seq Scan on orders  (cost=0.00..442970.50 rows=7282178 width=16) (actual time=0.031..8026.039 rows=7284445 loops=1)
                                       Filter: (o_orderdate < '1995-03-13'::date)
                                       Rows Removed by Filter: 7730555
                                       Buffers: shared hit=210387 read=44147 written=15
                                 ->  Hash  (cost=45978.34..45978.34 rows=300045 width=4) (actual time=1119.329..1119.329 rows=300036 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14645kB
                                       Buffers: shared hit=2 read=36425
                                       ->  Bitmap Heap Scan on customer  (cost=6949.78..45978.34 rows=300045 width=4) (actual time=109.316..971.920 rows=300036 loops=1)
                                             Recheck Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=2 read=36425
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6874.76 rows=300045 width=0) (actual time=97.593..97.593 rows=300036 loops=1)
                                                   Index Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                                   Buffers: shared read=1152
 Planning time: 6.216 ms
 Execution time: 46328.668 ms
(38 rows)

COMMIT;
COMMIT