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#41'
	and p_container = 'LG PACK'
	and l_quantity < (
		select
			0.2 * avg(l_quantity)
		from
			lineitem
		where
			l_partkey = p_partkey
	);
                                                                                         QUERY PLAN                                                                                          
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=403090.34..403090.35 rows=1 width=4) (actual time=800.683..800.683 rows=1 loops=1)
   Buffers: shared hit=66276 read=19330 dirtied=61
   ->  Nested Loop  (cost=140.78..403040.03 rows=20125 width=4) (actual time=1.292..799.143 rows=5403 loops=1)
         Buffers: shared hit=66276 read=19330 dirtied=61
         ->  Index Only Scan using part_p_container_p_brand_p_partkey_idx on part  (cost=0.00..7926.39 rows=2007 width=4) (actual time=0.243..38.693 rows=2042 loops=1)
               Index Cond: ((p_container = 'LG PACK'::bpchar) AND (p_brand = 'Brand#41'::bpchar))
               Heap Fetches: 2042
               Buffers: shared read=2008
         ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=140.78..196.77 rows=10 width=12) (actual time=0.008..0.010 rows=3 loops=2042)
               Index Cond: ((l_partkey = part.p_partkey) AND (l_quantity < (SubPlan 1)))
               Buffers: shared hit=13622
               SubPlan 1
                 ->  Aggregate  (cost=140.77..140.78 rows=1 width=4) (actual time=0.357..0.357 rows=1 loops=2042)
                       Buffers: shared hit=52654 read=17322 dirtied=61
                       ->  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=0.041..0.344 rows=30 loops=2042)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 61502
                             Buffers: shared hit=52654 read=17322 dirtied=61
               SubPlan 1
                 ->  Aggregate  (cost=140.77..140.78 rows=1 width=4) (actual time=0.357..0.357 rows=1 loops=2042)
                       Buffers: shared hit=52654 read=17322 dirtied=61
                       ->  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=0.041..0.344 rows=30 loops=2042)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 61502
                             Buffers: shared hit=52654 read=17322 dirtied=61
 Total runtime: 800.842 ms
(26 rows)

COMMIT;
COMMIT