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#52'
	and p_container = 'WRAP CAN'
	and l_quantity < (
		select
			0.2 * avg(l_quantity)
		from
			lineitem
		where
			l_partkey = p_partkey
	);
                                                                                         QUERY PLAN                                                                                          
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=398892.12..398892.13 rows=1 width=4) (actual time=1396.150..1396.150 rows=1 loops=1)
   Buffers: shared hit=53204 read=34622 dirtied=441
   ->  Nested Loop  (cost=140.78..398841.78 rows=20133 width=4) (actual time=1.798..1394.222 rows=5586 loops=1)
         Buffers: shared hit=53204 read=34622 dirtied=441
         ->  Index Only Scan using part_p_container_p_brand_p_partkey_idx on part  (cost=0.00..7846.02 rows=1986 width=4) (actual time=0.288..59.513 rows=2092 loops=1)
               Index Cond: ((p_container = 'WRAP CAN'::bpchar) AND (p_brand = 'Brand#52'::bpchar))
               Heap Fetches: 2092
               Buffers: shared hit=394 read=1662
         ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=140.78..196.78 rows=10 width=12) (actual time=0.016..0.020 rows=3 loops=2092)
               Index Cond: ((l_partkey = part.p_partkey) AND (l_quantity < (SubPlan 1)))
               Buffers: shared hit=14000
               SubPlan 1
                 ->  Aggregate  (cost=140.77..140.78 rows=1 width=4) (actual time=0.611..0.612 rows=1 loops=2092)
                       Buffers: shared hit=38810 read=32960 dirtied=441
                       ->  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=0.060..0.594 rows=30 loops=2092)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 63093
                             Buffers: shared hit=38810 read=32960 dirtied=441
               SubPlan 1
                 ->  Aggregate  (cost=140.77..140.78 rows=1 width=4) (actual time=0.611..0.612 rows=1 loops=2092)
                       Buffers: shared hit=38810 read=32960 dirtied=441
                       ->  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=0.060..0.594 rows=30 loops=2092)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 63093
                             Buffers: shared hit=38810 read=32960 dirtied=441
 Total runtime: 1396.421 ms
(26 rows)

COMMIT;
COMMIT