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 '1997-03-01'
	and l_shipdate < cast(date '1997-03-01' + interval '1 month' as date);
                                                                                  QUERY PLAN                                                                                  
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=1157020.06..1157020.08 rows=1 width=29) (actual time=24204.967..24204.967 rows=1 loops=1)
   Buffers: shared hit=526123 read=593710 dirtied=821 written=965
   ->  Hash Join  (cost=93374.24..1143866.49 rows=751633 width=29) (actual time=1601.971..23756.990 rows=774027 loops=1)
         Hash Cond: (lineitem.l_partkey = part.p_partkey)
         Buffers: shared hit=526123 read=593710 dirtied=821 written=965
         ->  Bitmap Heap Scan on lineitem  (cost=7852.24..1047069.99 rows=751633 width=12) (actual time=120.867..21480.562 rows=774027 loops=1)
               Recheck Cond: ((l_shipdate >= '1997-03-01'::date) AND (l_shipdate < '1997-04-01'::date))
               Rows Removed by Index Recheck: 59211511
               Heap Blocks: lossy=1079260
               Buffers: shared hit=521423 read=557885 dirtied=821 written=834
               ->  Bitmap Index Scan on lineitem_l_shipdate_l_suppkey_brin_idx  (cost=0.00..7664.33 rows=751633 width=0) (actual time=120.015..120.015 rows=10792960 loops=1)
                     Index Cond: ((l_shipdate >= '1997-03-01'::date) AND (l_shipdate < '1997-04-01'::date))
                     Buffers: shared hit=48
         ->  Hash  (cost=60522.00..60522.00 rows=2000000 width=25) (actual time=1474.884..1474.884 rows=2000000 loops=1)
               Buckets: 2097152  Batches: 1  Memory Usage: 131903kB
               Buffers: shared hit=4697 read=35825 written=131
               ->  Seq Scan on part  (cost=0.00..60522.00 rows=2000000 width=25) (actual time=0.009..853.895 rows=2000000 loops=1)
                     Buffers: shared hit=4697 read=35825 written=131
 Planning time: 2.257 ms
 Execution time: 24205.843 ms
(20 rows)

COMMIT;
COMMIT