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 '1995-03-24'
	and l_shipdate > date '1995-03-24'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2674320.50..2674320.53 rows=10 width=20) (actual time=36678.192..36678.196 rows=10 loops=1)
   Buffers: shared hit=781618 read=578762 dirtied=580 written=585
   ->  Sort  (cost=2674320.50..2682179.89 rows=3143755 width=20) (actual time=36678.189..36678.190 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=781618 read=578762 dirtied=580 written=585
         ->  HashAggregate  (cost=2574947.54..2606385.09 rows=3143755 width=20) (actual time=36588.575..36656.672 rows=113717 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=781612 read=578762 dirtied=580 written=585
               ->  Hash Join  (cost=552825.67..2527791.21 rows=3143755 width=20) (actual time=8969.846..36250.881 rows=300182 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=781612 read=578762 dirtied=580 written=585
                     ->  Seq Scan on lineitem  (cost=0.00..1822484.20 rows=32278344 width=12) (actual time=0.037..19476.409 rows=32140675 loops=1)
                           Filter: (l_shipdate > '1995-03-24'::date)
                           Rows Removed by Filter: 27904628
                           Buffers: shared hit=595269 read=474397 dirtied=580 written=576
                     ->  Hash  (cost=534491.11..534491.11 rows=1466765 width=12) (actual time=8956.758..8956.758 rows=1470512 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 79571kB
                           Buffers: shared hit=186343 read=104365 written=9
                           ->  Hash Join  (cost=49661.09..534491.11 rows=1466765 width=12) (actual time=878.939..8413.481 rows=1470512 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=186343 read=104365 written=9
                                 ->  Seq Scan on orders  (cost=0.00..442530.20 rows=7368580 width=16) (actual time=0.025..5014.044 rows=7353251 loops=1)
                                       Filter: (o_orderdate < '1995-03-24'::date)
                                       Rows Removed by Filter: 7661749
                                       Buffers: shared hit=184084 read=70197 written=9
                                 ->  Hash  (cost=45928.77..45928.77 rows=298585 width=4) (actual time=875.251..875.251 rows=300036 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14645kB
                                       Buffers: shared hit=2259 read=34168
                                       ->  Bitmap Heap Scan on customer  (cost=6918.46..45928.77 rows=298585 width=4) (actual time=79.372..766.330 rows=300036 loops=1)
                                             Recheck Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=2259 read=34168
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6843.81 rows=298585 width=0) (actual time=70.203..70.203 rows=300036 loops=1)
                                                   Index Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                                   Buffers: shared read=1152
 Planning time: 6.241 ms
 Execution time: 36706.494 ms
(38 rows)

COMMIT;
COMMIT