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#54'
	and p_container = 'LG CASE'
	and l_quantity < (
		select
			0.2 * avg(l_quantity)
		from
			lineitem
		where
			l_partkey = p_partkey
	);
                                                                                         QUERY PLAN                                                                                          
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=399684.75..399684.76 rows=1 width=4) (actual time=1095.128..1095.129 rows=1 loops=1)
   Buffers: shared hit=54378 read=28534 dirtied=53
   ->  Nested Loop  (cost=140.78..399634.86 rows=19955 width=4) (actual time=2.567..1093.314 rows=5299 loops=1)
         Buffers: shared hit=54378 read=28534 dirtied=53
         ->  Index Only Scan using part_p_container_p_brand_p_partkey_idx on part  (cost=0.00..7862.09 rows=1990 width=4) (actual time=0.561..47.187 rows=1978 loops=1)
               Index Cond: ((p_container = 'LG CASE'::bpchar) AND (p_brand = 'Brand#54'::bpchar))
               Heap Fetches: 1978
               Buffers: shared read=1945
         ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=140.78..196.77 rows=10 width=12) (actual time=0.010..0.013 rows=3 loops=1978)
               Index Cond: ((l_partkey = part.p_partkey) AND (l_quantity < (SubPlan 1)))
               Buffers: shared hit=13249
               SubPlan 1
                 ->  Aggregate  (cost=140.77..140.78 rows=1 width=4) (actual time=0.510..0.510 rows=1 loops=1978)
                       Buffers: shared hit=41129 read=26589 dirtied=53
                       ->  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=0.052..0.492 rows=30 loops=1978)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 59492
                             Buffers: shared hit=41129 read=26589 dirtied=53
               SubPlan 1
                 ->  Aggregate  (cost=140.77..140.78 rows=1 width=4) (actual time=0.510..0.510 rows=1 loops=1978)
                       Buffers: shared hit=41129 read=26589 dirtied=53
                       ->  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=0.052..0.492 rows=30 loops=1978)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 59492
                             Buffers: shared hit=41129 read=26589 dirtied=53
 Total runtime: 1095.501 ms
(26 rows)

COMMIT;
COMMIT