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#44'
	and p_container = 'MED PKG'
	and l_quantity < (
		select
			0.2 * avg(l_quantity)
		from
			lineitem
		where
			l_partkey = p_partkey
	);
                                                                                         QUERY PLAN                                                                                          
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=404902.93..404902.94 rows=1 width=4) (actual time=4711.009..4711.010 rows=1 loops=1)
   Buffers: shared hit=47261 read=37428 dirtied=370
   ->  Nested Loop  (cost=140.78..404851.94 rows=20397 width=4) (actual time=3.027..4708.011 rows=5386 loops=1)
         Buffers: shared hit=47261 read=37428 dirtied=370
         ->  Index Only Scan using part_p_container_p_brand_p_partkey_idx on part  (cost=0.00..7962.82 rows=2016 width=4) (actual time=0.520..85.110 rows=2017 loops=1)
               Index Cond: ((p_container = 'MED PKG'::bpchar) AND (p_brand = 'Brand#44'::bpchar))
               Heap Fetches: 2017
               Buffers: shared hit=1253 read=734
         ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=140.78..196.77 rows=10 width=12) (actual time=0.099..0.137 rows=3 loops=2017)
               Index Cond: ((l_partkey = part.p_partkey) AND (l_quantity < (SubPlan 1)))
               Buffers: shared hit=13508
               SubPlan 1
                 ->  Aggregate  (cost=140.77..140.78 rows=1 width=4) (actual time=2.144..2.144 rows=1 loops=2017)
                       Buffers: shared hit=32500 read=36694 dirtied=370
                       ->  Index Only Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=0.00..140.69 rows=31 width=4) (actual time=0.266..2.120 rows=30 loops=2017)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 60818
                             Buffers: shared hit=32500 read=36694 dirtied=370
               SubPlan 1
                 ->  Aggregate  (cost=140.77..140.78 rows=1 width=4) (actual time=2.144..2.144 rows=1 loops=2017)
                       Buffers: shared hit=32500 read=36694 dirtied=370
                       ->  Index Only Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=0.00..140.69 rows=31 width=4) (actual time=0.266..2.120 rows=30 loops=2017)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 60818
                             Buffers: shared hit=32500 read=36694 dirtied=370
 Total runtime: 4711.493 ms
(26 rows)

COMMIT;
COMMIT