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 '1993-07-01'
	and l_shipdate < cast(date '1993-07-01' + interval '1 month' as date);
                                                                                  QUERY PLAN                                                                                  
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=1172124.82..1172124.83 rows=1 width=29) (actual time=27348.029..27348.030 rows=1 loops=1)
   Buffers: shared hit=967529 read=152304 written=122
   ->  Hash Join  (cost=93710.57..1158397.01 rows=784446 width=29) (actual time=1369.317..26874.729 rows=773357 loops=1)
         Hash Cond: (lineitem.l_partkey = part.p_partkey)
         Buffers: shared hit=967529 read=152304 written=122
         ->  Bitmap Heap Scan on lineitem  (cost=8188.57..1061108.32 rows=784446 width=12) (actual time=124.095..24796.157 rows=773357 loops=1)
               Recheck Cond: ((l_shipdate >= '1993-07-01'::date) AND (l_shipdate < '1993-08-01'::date))
               Rows Removed by Index Recheck: 59212181
               Heap Blocks: lossy=1079260
               Buffers: shared hit=927004 read=152304 written=122
               ->  Bitmap Index Scan on lineitem_l_shipdate_l_suppkey_brin_idx  (cost=0.00..7992.46 rows=784446 width=0) (actual time=123.241..123.241 rows=10792960 loops=1)
                     Index Cond: ((l_shipdate >= '1993-07-01'::date) AND (l_shipdate < '1993-08-01'::date))
                     Buffers: shared hit=48
         ->  Hash  (cost=60522.00..60522.00 rows=2000000 width=25) (actual time=1238.958..1238.958 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=0.010..632.529 rows=2000000 loops=1)
                     Buffers: shared hit=40522
 Planning time: 2.540 ms
 Execution time: 27348.938 ms
(20 rows)

COMMIT;
COMMIT