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 '1995-03-20'
	and l_shipdate > date '1995-03-20'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2699301.44..2699301.46 rows=10 width=20) (actual time=33155.334..33155.337 rows=10 loops=1)
   Buffers: shared hit=730459 read=641796 dirtied=646 written=689
   ->  Sort  (cost=2699301.44..2707277.36 rows=3190367 width=20) (actual time=33155.331..33155.333 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=730459 read=641796 dirtied=646 written=689
         ->  HashAggregate  (cost=2598455.08..2630358.75 rows=3190367 width=20) (actual time=33092.159..33136.241 rows=113955 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=730453 read=641796 dirtied=646 written=689
               ->  Hash Join  (cost=557530.52..2550599.58 rows=3190367 width=20) (actual time=9174.627..32839.181 rows=300458 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=730453 read=641796 dirtied=646 written=689
                     ->  Seq Scan on lineitem  (cost=0.00..1838834.20 rows=32621651 width=12) (actual time=0.029..17223.225 rows=32239322 loops=1)
                           Filter: (l_shipdate > '1995-03-20'::date)
                           Rows Removed by Filter: 27805975
                           Buffers: shared hit=541073 read=538189 dirtied=646 written=653
                     ->  Hash  (cost=538954.92..538954.92 rows=1486048 width=12) (actual time=9161.787..9161.787 rows=1465562 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 79358kB
                           Buffers: shared hit=189380 read=103607 written=36
                           ->  Hash Join  (cost=49723.50..538954.92 rows=1486048 width=12) (actual time=515.129..8559.562 rows=1465562 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=189380 read=103607 written=36
                                 ->  Seq Scan on orders  (cost=0.00..446496.39 rows=7433214 width=16) (actual time=0.074..4904.502 rows=7328465 loops=1)
                                       Filter: (o_orderdate < '1995-03-20'::date)
                                       Rows Removed by Filter: 7686535
                                       Buffers: shared hit=154106 read=102454 written=36
                                 ->  Hash  (cost=45975.00..45975.00 rows=299880 width=4) (actual time=511.341..511.341 rows=300036 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14645kB
                                       Buffers: shared hit=35274 read=1153
                                       ->  Bitmap Heap Scan on customer  (cost=6948.50..45975.00 rows=299880 width=4) (actual time=71.432..407.100 rows=300036 loops=1)
                                             Recheck Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=35274 read=1153
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6873.53 rows=299880 width=0) (actual time=62.333..62.333 rows=300036 loops=1)
                                                   Index Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                                   Buffers: shared read=1152
 Planning time: 3.520 ms
 Execution time: 33175.086 ms
(38 rows)

COMMIT;
COMMIT