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=2699284.15..2699284.18 rows=10 width=20) (actual time=30996.451..30996.455 rows=10 loops=1)
   Buffers: shared hit=750046 read=622926 written=249
   ->  Sort  (cost=2699284.15..2707219.32 rows=3174065 width=20) (actual time=30996.448..30996.449 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=750046 read=622926 written=249
         ->  HashAggregate  (cost=2598953.10..2630693.75 rows=3174065 width=20) (actual time=30940.939..30977.328 rows=113653 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=750040 read=622926 written=249
               ->  Hash Join  (cost=557335.30..2551342.12 rows=3174065 width=20) (actual time=8402.429..30699.601 rows=300027 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=750040 read=622926 written=249
                     ->  Seq Scan on lineitem  (cost=0.00..1840055.36 rows=32589550 width=12) (actual time=0.077..17332.947 rows=32107599 loops=1)
                           Filter: (l_shipdate > '1995-03-24'::date)
                           Rows Removed by Filter: 27877939
                           Buffers: shared hit=475280 read=604699
                     ->  Hash  (cost=538836.41..538836.41 rows=1479911 width=12) (actual time=8390.084..8390.084 rows=1469147 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 79512kB
                           Buffers: shared hit=274760 read=18227 written=249
                           ->  Hash Join  (cost=49661.09..538836.41 rows=1479911 width=12) (actual time=502.372..7860.565 rows=1469147 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=274760 read=18227 written=249
                                 ->  Seq Scan on orders  (cost=0.00..446496.39 rows=7434621 width=16) (actual time=0.031..4925.387 rows=7346121 loops=1)
                                       Filter: (o_orderdate < '1995-03-24'::date)
                                       Rows Removed by Filter: 7653879
                                       Buffers: shared hit=239484 read=17076 written=170
                                 ->  Hash  (cost=45928.77..45928.77 rows=298585 width=4) (actual time=499.285..499.285 rows=300036 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14645kB
                                       Buffers: shared hit=35276 read=1151 written=79
                                       ->  Bitmap Heap Scan on customer  (cost=6918.46..45928.77 rows=298585 width=4) (actual time=77.654..415.383 rows=300036 loops=1)
                                             Recheck Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=35276 read=1151 written=79
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6843.81 rows=298585 width=0) (actual time=68.691..68.691 rows=300036 loops=1)
                                                   Index Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                                   Buffers: shared hit=1 read=1151 written=79
 Planning time: 3.890 ms
 Execution time: 31025.230 ms
(38 rows)

COMMIT;
COMMIT