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 '1996-12-01'
	and l_shipdate < cast(date '1996-12-01' + interval '1 month' as date);
                                                                                  QUERY PLAN                                                                                  
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=1166687.35..1166687.36 rows=1 width=29) (actual time=26754.270..26754.271 rows=1 loops=1)
   Buffers: shared hit=675973 read=443860 written=160
   ->  Hash Join  (cost=93586.36..1153171.61 rows=772328 width=29) (actual time=1358.010..26285.417 rows=772430 loops=1)
         Hash Cond: (lineitem.l_partkey = part.p_partkey)
         Buffers: shared hit=675973 read=443860 written=160
         ->  Bitmap Heap Scan on lineitem  (cost=8064.36..1056064.69 rows=772328 width=12) (actual time=121.379..24214.310 rows=772430 loops=1)
               Recheck Cond: ((l_shipdate >= '1996-12-01'::date) AND (l_shipdate < '1997-01-01'::date))
               Rows Removed by Index Recheck: 59213108
               Heap Blocks: lossy=1079260
               Buffers: shared hit=635448 read=443860 written=160
               ->  Bitmap Index Scan on lineitem_l_shipdate_l_suppkey_brin_idx  (cost=0.00..7871.28 rows=772328 width=0) (actual time=120.605..120.605 rows=10792960 loops=1)
                     Index Cond: ((l_shipdate >= '1996-12-01'::date) AND (l_shipdate < '1997-01-01'::date))
                     Buffers: shared hit=48
         ->  Hash  (cost=60522.00..60522.00 rows=2000000 width=25) (actual time=1230.392..1230.392 rows=2000000 loops=1)
               Buckets: 2097152  Batches: 1  Memory Usage: 131903kB
               Buffers: shared hit=40522
               ->  Seq Scan on part  (cost=0.00..60522.00 rows=2000000 width=25) (actual time=0.009..626.223 rows=2000000 loops=1)
                     Buffers: shared hit=40522
 Planning time: 2.292 ms
 Execution time: 26755.169 ms
(20 rows)

COMMIT;
COMMIT