BEGIN;
BEGIN
EXPLAIN (ANALYZE, BUFFERS)
select
	sum(l_extendedprice) / 7.0 as avg_yearly
from
	lineitem,
	part
where
	p_partkey = l_partkey
	and p_brand = 'Brand#22'
	and p_container = 'SM PKG'
	and l_quantity < (
		select
			0.2 * avg(l_quantity)
		from
			lineitem
		where
			l_partkey = p_partkey
	);
                                                                                         QUERY PLAN                                                                                          
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=414935.55..414935.56 rows=1 width=4) (actual time=1975.831..1975.831 rows=1 loops=1)
   Buffers: shared hit=45765 read=38731 dirtied=382
   ->  Nested Loop  (cost=144.80..414885.29 rows=20103 width=4) (actual time=2.818..1973.714 rows=5336 loops=1)
         Buffers: shared hit=45765 read=38731 dirtied=382
         ->  Index Only Scan using part_p_container_p_brand_p_partkey_idx on part  (cost=0.00..7849.10 rows=1987 width=4) (actual time=0.602..75.095 rows=2012 loops=1)
               Index Cond: ((p_container = 'SM PKG'::bpchar) AND (p_brand = 'Brand#22'::bpchar))
               Heap Fetches: 2012
               Buffers: shared read=1971
         ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=144.80..204.74 rows=11 width=12) (actual time=0.024..0.035 rows=3 loops=2012)
               Index Cond: ((l_partkey = part.p_partkey) AND (l_quantity < (SubPlan 1)))
               Buffers: shared hit=13432
               SubPlan 1
                 ->  Aggregate  (cost=144.79..144.80 rows=1 width=4) (actual time=0.901..0.902 rows=1 loops=2012)
                       Buffers: shared hit=32333 read=36760 dirtied=382
                       ->  Index Only Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=0.00..144.70 rows=32 width=4) (actual time=0.093..0.882 rows=30 loops=2012)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 60728
                             Buffers: shared hit=32333 read=36760 dirtied=382
               SubPlan 1
                 ->  Aggregate  (cost=144.79..144.80 rows=1 width=4) (actual time=0.901..0.902 rows=1 loops=2012)
                       Buffers: shared hit=32333 read=36760 dirtied=382
                       ->  Index Only Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=0.00..144.70 rows=32 width=4) (actual time=0.093..0.882 rows=30 loops=2012)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 60728
                             Buffers: shared hit=32333 read=36760 dirtied=382
 Total runtime: 1976.182 ms
(26 rows)

COMMIT;
COMMIT