BEGIN;
BEGIN
EXPLAIN (ANALYZE, BUFFERS)
select
	100.00 * sum(case
		when p_type like 'PROMO%'
			then l_extendedprice * (1 - l_discount)
		else 0
	end) / sum(l_extendedprice * (1 - l_discount)) as promo_revenue
from
	lineitem,
	part
where
	l_partkey = p_partkey
	and l_shipdate >= date '1996-05-01'
	and l_shipdate < cast(date '1996-05-01' + interval '1 month' as date);
                                                                                  QUERY PLAN                                                                                  
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=1164633.91..1164633.93 rows=1 width=29) (actual time=24867.701..24867.701 rows=1 loops=1)
   Buffers: shared hit=782758 read=326420 written=134
   ->  Hash Join  (cost=93706.90..1150912.39 rows=784087 width=29) (actual time=1365.376..24409.857 rows=773578 loops=1)
         Hash Cond: (lineitem.l_partkey = part.p_partkey)
         Buffers: shared hit=782758 read=326420 written=134
         ->  Bitmap Heap Scan on lineitem  (cost=8184.90..1053629.08 rows=784087 width=12) (actual time=119.511..22286.531 rows=773578 loops=1)
               Recheck Cond: ((l_shipdate >= '1996-05-01'::date) AND (l_shipdate < '1996-06-01'::date))
               Rows Removed by Index Recheck: 59271801
               Heap Blocks: lossy=1068605
               Buffers: shared hit=742814 read=325839 written=134
               ->  Bitmap Index Scan on lineitem_l_shipdate_l_suppkey_brin_idx  (cost=0.00..7988.87 rows=784087 width=0) (actual time=118.772..118.772 rows=10686720 loops=1)
                     Index Cond: ((l_shipdate >= '1996-05-01'::date) AND (l_shipdate < '1996-06-01'::date))
                     Buffers: shared hit=48
         ->  Hash  (cost=60522.00..60522.00 rows=2000000 width=25) (actual time=1239.647..1239.647 rows=2000000 loops=1)
               Buckets: 2097152  Batches: 1  Memory Usage: 131903kB
               Buffers: shared hit=39941 read=581
               ->  Seq Scan on part  (cost=0.00..60522.00 rows=2000000 width=25) (actual time=0.009..623.107 rows=2000000 loops=1)
                     Buffers: shared hit=39941 read=581
 Planning time: 2.367 ms
 Execution time: 24868.868 ms
(20 rows)

COMMIT;
COMMIT