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 CAN'
	and l_quantity < (
		select
			0.2 * avg(l_quantity)
		from
			lineitem
		where
			l_partkey = p_partkey
	);
                                                                                        QUERY PLAN                                                                                         
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=113678.85..113678.86 rows=1 width=4) (actual time=193.603..193.603 rows=1 loops=1)
   Buffers: shared hit=73499 read=5346 dirtied=211 written=6
   ->  Nested Loop  (cost=82.62..113628.73 rows=20045 width=4) (actual time=1.521..192.517 rows=5253 loops=1)
         Buffers: shared hit=73499 read=5346 dirtied=211 written=6
         ->  Bitmap Heap Scan on part  (cost=72.86..6607.40 rows=1993 width=4) (actual time=1.218..33.442 rows=1944 loops=1)
               Recheck Cond: ((p_container = 'LG CAN'::bpchar) AND (p_brand = 'Brand#54'::bpchar))
               Heap Blocks: exact=1908
               Buffers: shared hit=224 read=1698 written=1
               ->  Bitmap Index Scan on part_p_container_p_brand_p_partkey_idx  (cost=0.00..72.36 rows=1993 width=0) (actual time=0.919..0.919 rows=1944 loops=1)
                     Index Cond: ((p_container = 'LG CAN'::bpchar) AND (p_brand = 'Brand#54'::bpchar))
                     Buffers: shared read=14
         ->  Index Scan using lineitem_l_partkey_l_quantity_idx on lineitem  (cost=9.76..53.60 rows=10 width=12) (actual time=0.014..0.033 rows=3 loops=1944)
               Index Cond: ((l_partkey = part.p_partkey) AND (l_quantity < (SubPlan 1)))
               Buffers: shared hit=11531 read=1533 written=3
               SubPlan 1
                 ->  Aggregate  (cost=9.19..9.20 rows=1 width=4) (actual time=0.046..0.046 rows=1 loops=1944)
                       Buffers: shared hit=61744 read=2115 dirtied=211 written=2
                       ->  Index Only Scan using lineitem_l_partkey_l_quantity_idx on lineitem lineitem_1  (cost=0.56..9.11 rows=31 width=4) (actual time=0.023..0.041 rows=30 loops=1944)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 701
                             Buffers: shared hit=61744 read=2115 dirtied=211 written=2
               SubPlan 1
                 ->  Aggregate  (cost=9.19..9.20 rows=1 width=4) (actual time=0.046..0.046 rows=1 loops=1944)
                       Buffers: shared hit=61744 read=2115 dirtied=211 written=2
                       ->  Index Only Scan using lineitem_l_partkey_l_quantity_idx on lineitem lineitem_1  (cost=0.56..9.11 rows=31 width=4) (actual time=0.023..0.041 rows=30 loops=1944)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 701
                             Buffers: shared hit=61744 read=2115 dirtied=211 written=2
 Planning time: 3.138 ms
 Execution time: 193.766 ms
(30 rows)

COMMIT;
COMMIT