SET any_join_distinct_right_table_keys = 1;
SET joined_subquery_requires_alias = 0;

SELECT k, a1, b1, a2, b2 FROM (SELECT 0 AS k, 'hello' AS a1, 123 AS b1, a1) ANY FULL OUTER JOIN (SELECT 1 AS k, 'hello' AS a2, 456 AS b2, a2) USING (k) ORDER BY k;
SELECT k, a, b FROM (SELECT 0 AS k, 'hello' AS a, 123 AS b, a) ANY FULL OUTER JOIN (SELECT 1 AS k) USING (k) ORDER BY k;

SET join_use_nulls = 1;

SELECT k, a1, b1, a2, b2 FROM (SELECT 0 AS k, 'hello' AS a1, 123 AS b1, a1) ANY FULL OUTER JOIN (SELECT 1 AS k, 'hello' AS a2, 456 AS b2, a2) USING (k) ORDER BY k;
SELECT k, a, b FROM (SELECT 0 AS k, 'hello' AS a, 123 AS b, a) ANY FULL OUTER JOIN (SELECT 1 AS k) USING (k) ORDER BY k;