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 '1997-12-01'
	and l_shipdate < cast(date '1997-12-01' + interval '1 month' as date);
                                                                                  QUERY PLAN                                                                                  
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=1164124.44..1164124.45 rows=1 width=29) (actual time=23275.381..23275.381 rows=1 loops=1)
   Buffers: shared hit=573220 read=544470 dirtied=973 written=9224
   ->  Hash Join  (cost=93561.28..1150651.52 rows=769881 width=29) (actual time=1350.513..22830.232 rows=772832 loops=1)
         Hash Cond: (lineitem.l_partkey = part.p_partkey)
         Buffers: shared hit=573220 read=544470 dirtied=973 written=9224
         ->  Bitmap Heap Scan on lineitem  (cost=8039.28..1053581.30 rows=769881 width=12) (actual time=121.028..20863.532 rows=772832 loops=1)
               Recheck Cond: ((l_shipdate >= '1997-12-01'::date) AND (l_shipdate < '1998-01-01'::date))
               Rows Removed by Index Recheck: 59272040
               Heap Blocks: lossy=1077117
               Buffers: shared hit=532699 read=544466 dirtied=973 written=9224
               ->  Bitmap Index Scan on lineitem_l_shipdate_l_suppkey_brin_idx  (cost=0.00..7846.81 rows=769881 width=0) (actual time=120.208..120.208 rows=10771200 loops=1)
                     Index Cond: ((l_shipdate >= '1997-12-01'::date) AND (l_shipdate < '1998-01-01'::date))
                     Buffers: shared hit=16 read=32
         ->  Hash  (cost=60522.00..60522.00 rows=2000000 width=25) (actual time=1223.227..1223.227 rows=2000000 loops=1)
               Buckets: 2097152  Batches: 1  Memory Usage: 131903kB
               Buffers: shared hit=40518 read=4
               ->  Seq Scan on part  (cost=0.00..60522.00 rows=2000000 width=25) (actual time=0.010..619.509 rows=2000000 loops=1)
                     Buffers: shared hit=40518 read=4
 Planning time: 2.238 ms
 Execution time: 23276.262 ms
(20 rows)

COMMIT;
COMMIT