SET any_join_distinct_right_table_keys = 1;

SELECT a, b FROM (SELECT 1 AS a, 2000 AS b) js1 ANY RIGHT JOIN (SELECT 2 AS a, 3000 AS b) js2 USING a, b ORDER BY a, b;
SELECT a, b FROM (SELECT 1 AS a, 2000 AS b) js1 ANY RIGHT JOIN (SELECT 2 AS a, 3000 AS b) js2 USING b, a ORDER BY a, b;

SELECT a, b FROM (SELECT 1 AS a, 2000 AS b) js1 ANY RIGHT JOIN (SELECT 2 AS a, 3000 AS b UNION ALL SELECT 1 AS a, 2000 AS b) js2 USING a, b ORDER BY a, b;
SELECT a, b FROM (SELECT 1 AS a, 2000 AS b) js1 ANY RIGHT JOIN (SELECT 2 AS a, 3000 AS b UNION ALL SELECT 1 AS a, 2000 AS b) js2 USING b, a ORDER BY a, b;