How optimize SQL query with JOIN many values? - sql

Question

I have a query like this where join ~6000 values:
SELECT MAX(user_id) as user_id, SUM(sum_amount_win) as sum_amount_win
FROM (
SELECT
a1.user_id
,CASE When MAX(currency) = 'RUB' Then SUM(d1.amount_cents) END as sum_amount_win
FROM dense_balance_transactions as d1
JOIN accounts a1 ON a1.id = d1.account_id
JOIN (
VALUES (5),(22),(26) -- ~6000 values
) AS v(user_id) USING (user_id)
WHERE d1.created_at BETWEEN '2019-06-01 00:00:00' AND '2019-06-20 23:59:59'
AND d1.action='win'
GROUP BY a1.user_id, a1.currency
) as t
GROUP BY user_id
QUERY PLAN for query with many VALUES:
GroupAggregate (cost=266816.48..266816.54 rows=1 width=48) (actual time=5024.201..5102.633 rows=5745 loops=1)
Group Key: a1.user_id
Buffers: shared hit=12205927
-> GroupAggregate (cost=266816.48..266816.51 rows=1 width=44) (actual time=5024.185..5099.621 rows=5774 loops=1)
Group Key: a1.user_id, a1.currency
Buffers: shared hit=12205927
-> Sort (cost=266816.48..266816.49 rows=1 width=20) (actual time=5024.170..5041.840 rows=291122 loops=1)
Sort Key: a1.user_id, a1.currency
Sort Method: quicksort Memory: 35032kB
Buffers: shared hit=12205927
-> Gather (cost=214410.62..266816.47 rows=1 width=20) (actual time=292.828..5204.320 rows=291122 loops=1)
Workers Planned: 5
Workers Launched: 5
Buffers: shared hit=12205921
-> Nested Loop (cost=213410.62..265816.37 rows=1 width=20) (actual time=255.028..3939.300 rows=48520 loops=6)
Buffers: shared hit=12205921
-> Merge Join (cost=213410.19..214522.45 rows=1269 width=20) (actual time=253.545..274.872 rows=1136 loops=6)
Merge Cond: (a1.user_id = "*VALUES*".column1)
Buffers: shared hit=191958
-> Sort (cost=212958.66..213493.45 rows=213914 width=20) (actual time=251.991..263.828 rows=82468 loops=6)
Sort Key: a1.user_id
Sort Method: quicksort Memory: 24322kB
Buffers: shared hit=191916
-> Parallel Seq Scan on accounts a1 (cost=0.00..194020.14 rows=213914 width=20) (actual time=0.042..196.052 rows=179242 loops=6)
Buffers: shared hit=191881
-> Sort (cost=451.52..466.52 rows=6000 width=4) (actual time=1.547..2.429 rows=6037 loops=6)
Sort Key: "*VALUES*".column1
Sort Method: quicksort Memory: 474kB
Buffers: shared hit=42
-> Values Scan on "*VALUES*" (cost=0.00..75.00 rows=6000 width=4) (actual time=0.002..0.928 rows=6000 loops=6)
-> Index Scan using index_dense_balance_transactions_on_account_id on dense_balance_transactions d1 (cost=0.44..40.41 rows=1 width=16) (actual time=0.160..3.220 rows=43 loops=6816)
Index Cond: (account_id = a1.id)
Filter: ((created_at >= '2019-06-01 00:00:00'::timestamp without time zone) AND (created_at <= '2019-06-20 23:59:59'::timestamp without time zone) AND ((action)::text = 'win'::text))
Rows Removed by Filter: 1942
Buffers: shared hit=12013963
Planning time: 10.239 ms
Execution time: 5387.523 ms
I use PosgreSQL 10.8.0.
Is there any chance to speed up this query?