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#55'
	and p_container = 'MED CASE'
	and l_quantity < (
		select
			0.2 * avg(l_quantity)
		from
			lineitem
		where
			l_partkey = p_partkey
	);
                                                                                         QUERY PLAN                                                                                          
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=391266.38..391266.39 rows=1 width=4) (actual time=1352.760..1352.761 rows=1 loops=1)
   Buffers: shared hit=49753 read=32589 dirtied=87
   ->  Nested Loop  (cost=140.78..391217.54 rows=19534 width=4) (actual time=3.150..1351.056 rows=5353 loops=1)
         Buffers: shared hit=49753 read=32589 dirtied=87
         ->  Index Only Scan using part_p_container_p_brand_p_partkey_idx on part  (cost=0.00..7697.30 rows=1948 width=4) (actual time=0.663..51.178 rows=1960 loops=1)
               Index Cond: ((p_container = 'MED CASE'::bpchar) AND (p_brand = 'Brand#55'::bpchar))
               Heap Fetches: 1960
               Buffers: shared hit=191 read=1734
         ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=140.78..196.78 rows=10 width=12) (actual time=0.017..0.022 rows=3 loops=1960)
               Index Cond: ((l_partkey = part.p_partkey) AND (l_quantity < (SubPlan 1)))
               Buffers: shared hit=13242
               SubPlan 1
                 ->  Aggregate  (cost=140.77..140.78 rows=1 width=4) (actual time=0.635..0.635 rows=1 loops=1960)
                       Buffers: shared hit=36320 read=30855 dirtied=87
                       ->  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=0.068..0.619 rows=30 loops=1960)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 59032
                             Buffers: shared hit=36320 read=30855 dirtied=87
               SubPlan 1
                 ->  Aggregate  (cost=140.77..140.78 rows=1 width=4) (actual time=0.635..0.635 rows=1 loops=1960)
                       Buffers: shared hit=36320 read=30855 dirtied=87
                       ->  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=0.068..0.619 rows=30 loops=1960)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 59032
                             Buffers: shared hit=36320 read=30855 dirtied=87
 Total runtime: 1353.051 ms
(26 rows)

COMMIT;
COMMIT