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 = 'MACHINERY'
	and c_custkey = o_custkey
	and l_orderkey = o_orderkey
	and o_orderdate < date '1995-03-21'
	and l_shipdate > date '1995-03-21'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                              QUERY PLAN                                                                                               
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2743601.08..2743601.10 rows=10 width=20) (actual time=82335.950..82335.955 rows=10 loops=1)
   Buffers: shared hit=517714 read=840044 dirtied=252 written=14
   ->  Sort  (cost=2743601.08..2751484.26 rows=3153274 width=20) (actual time=82335.945..82335.946 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=517714 read=840044 dirtied=252 written=14
         ->  HashAggregate  (cost=2643927.22..2675459.96 rows=3153274 width=20) (actual time=82252.148..82313.715 rows=113456 loops=1)
               Buffers: shared hit=517708 read=840044 dirtied=252 written=14
               ->  Hash Join  (cost=625342.19..2596628.11 rows=3153274 width=20) (actual time=28161.439..81774.969 rows=300316 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=517708 read=840044 dirtied=252 written=14
                     ->  Seq Scan on lineitem  (cost=0.00..1818874.98 rows=32234187 width=12) (actual time=0.071..29557.140 rows=32215495 loops=1)
                           Filter: (l_shipdate > '1995-03-21'::date)
                           Rows Removed by Filter: 27830108
                           Buffers: shared hit=387665 read=679881 written=1
                     ->  Hash  (cost=606963.57..606963.57 rows=1470290 width=12) (actual time=28159.209..28159.209 rows=1466445 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 63012kB
                           Buffers: shared hit=130043 read=160163 dirtied=252 written=13
                           ->  Hash Join  (cost=49762.24..606963.57 rows=1470290 width=12) (actual time=768.325..26248.688 rows=1466445 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=130043 read=160163 dirtied=252 written=13
                                 ->  Seq Scan on orders  (cost=0.00..441649.60 rows=7334460 width=16) (actual time=0.012..7790.040 rows=7334548 loops=1)
                                       Filter: (o_orderdate < '1995-03-21'::date)
                                       Rows Removed by Filter: 7680452
                                       Buffers: shared hit=94767 read=159008 dirtied=252 written=13
                                 ->  Hash  (cost=46003.55..46003.55 rows=300695 width=4) (actual time=768.041..768.041 rows=300441 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10563kB
                                       Buffers: shared hit=35276 read=1155
                                       ->  Bitmap Heap Scan on customer  (cost=6966.87..46003.55 rows=300695 width=4) (actual time=123.577..617.258 rows=300441 loops=1)
                                             Recheck Cond: (c_mktsegment = 'MACHINERY'::bpchar)
                                             Buffers: shared hit=35276 read=1155
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6891.69 rows=300695 width=0) (actual time=112.609..112.609 rows=300441 loops=1)
                                                   Index Cond: (c_mktsegment = 'MACHINERY'::bpchar)
                                                   Buffers: shared read=1155
 Total runtime: 82385.960 ms
(35 rows)

COMMIT;
COMMIT