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 = 'FURNITURE'
	and c_custkey = o_custkey
	and l_orderkey = o_orderkey
	and o_orderdate < date '1995-03-06'
	and l_shipdate > date '1995-03-06'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2699012.38..2699012.40 rows=10 width=20) (actual time=34674.200..34674.206 rows=10 loops=1)
   Buffers: shared hit=708995 read=663258 written=71
   ->  Sort  (cost=2699012.38..2706957.46 rows=3178031 width=20) (actual time=34674.196..34674.198 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=708995 read=663258 written=71
         ->  HashAggregate  (cost=2598555.96..2630336.27 rows=3178031 width=20) (actual time=34605.772..34654.654 rows=113535 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=708989 read=663258 written=71
               ->  Hash Join  (cost=556716.27..2550885.50 rows=3178031 width=20) (actual time=8442.547..34295.219 rows=299091 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=708989 read=663258 written=71
                     ->  Seq Scan on lineitem  (cost=0.00..1838834.20 rows=32947925 width=12) (actual time=0.056..17644.269 rows=32589805 loops=1)
                           Filter: (l_shipdate > '1995-03-06'::date)
                           Rows Removed by Filter: 27455492
                           Buffers: shared hit=525013 read=554249
                     ->  Hash  (cost=538395.73..538395.73 rows=1465643 width=12) (actual time=8430.966..8430.966 rows=1448718 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 78634kB
                           Buffers: shared hit=183976 read=109009 written=71
                           ->  Hash Join  (cost=49689.56..538395.73 rows=1465643 width=12) (actual time=434.413..7890.021 rows=1448718 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=183976 read=109009 written=71
                                 ->  Seq Scan on orders  (cost=0.00..446496.39 rows=7347562 width=16) (actual time=0.024..5007.318 rows=7240784 loops=1)
                                       Filter: (o_orderdate < '1995-03-06'::date)
                                       Rows Removed by Filter: 7774216
                                       Buffers: shared hit=148703 read=107857 written=71
                                 ->  Hash  (cost=45949.43..45949.43 rows=299210 width=4) (actual time=431.531..431.531 rows=299496 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14626kB
                                       Buffers: shared hit=35273 read=1152
                                       ->  Bitmap Heap Scan on customer  (cost=6931.30..45949.43 rows=299210 width=4) (actual time=66.899..351.967 rows=299496 loops=1)
                                             Recheck Cond: (c_mktsegment = 'FURNITURE'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=35273 read=1152
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6856.50 rows=299210 width=0) (actual time=58.537..58.537 rows=299496 loops=1)
                                                   Index Cond: (c_mktsegment = 'FURNITURE'::bpchar)
                                                   Buffers: shared read=1150
 Planning time: 3.689 ms
 Execution time: 34704.968 ms
(38 rows)

COMMIT;
COMMIT