DROP TABLE IF EXISTS view_no_nulls;
DROP TABLE IF EXISTS view_no_nulls_set;
DROP TABLE IF EXISTS view_nulls_set;
DROP TABLE IF EXISTS view_nulls;

SET join_use_nulls = 0;

CREATE OR REPLACE VIEW view_no_nulls AS
SELECT * FROM ( SELECT number + 1 AS a, number + 11 AS b FROM numbers(2) ) AS t1
FULL JOIN ( SELECT number + 2 AS a, number + 22 AS c FROM numbers(2) ) AS t2
USING a ORDER BY a;

CREATE OR REPLACE VIEW view_nulls_set AS
SELECT * FROM ( SELECT number + 1 AS a, number + 11 AS b FROM numbers(2) ) AS t1
FULL JOIN ( SELECT number + 2 AS a, number + 22 AS c FROM numbers(2) ) AS t2
USING a ORDER BY a
SETTINGS join_use_nulls = 1;

SET join_use_nulls = 1;

CREATE OR REPLACE VIEW view_nulls AS
SELECT * FROM ( SELECT number + 1 AS a, number + 11 AS b FROM numbers(2) ) AS t1
FULL JOIN ( SELECT number + 2 AS a, number + 22 AS c FROM numbers(2) ) AS t2
USING a ORDER BY a;

CREATE OR REPLACE VIEW view_no_nulls_set AS
SELECT * FROM ( SELECT number + 1 AS a, number + 11 AS b FROM numbers(2) ) AS t1
FULL JOIN ( SELECT number + 2 AS a, number + 22 AS c FROM numbers(2) ) AS t2
USING a ORDER BY a
SETTINGS join_use_nulls = 0;

SET join_use_nulls = 1;

SELECT 'join_use_nulls = 1';

SELECT '-';
SELECT * FROM view_no_nulls; -- { serverError INCORRECT_QUERY }
SELECT '-';
SELECT * FROM view_no_nulls_set;
SELECT '-';
SELECT * FROM view_nulls_set;
SELECT '-';
SELECT * FROM view_nulls;

SET join_use_nulls = 0;

SELECT 'join_use_nulls = 0';

SELECT '-';
SELECT * FROM view_no_nulls;
SELECT '-';
SELECT * FROM view_no_nulls_set;
SELECT '-';
SELECT * FROM view_nulls_set;
SELECT '-';
SELECT * FROM view_nulls;

DETACH TABLE view_no_nulls;
DETACH TABLE view_no_nulls_set;
DETACH TABLE view_nulls_set;
DETACH TABLE view_nulls;

ATTACH TABLE view_no_nulls;
ATTACH TABLE view_no_nulls_set;
ATTACH TABLE view_nulls_set;
ATTACH TABLE view_nulls;

SET join_use_nulls = 1;

SELECT 'join_use_nulls = 1';

SELECT '-';
SELECT * FROM view_no_nulls; -- { serverError INCORRECT_QUERY }
SELECT '-';
SELECT * FROM view_no_nulls_set;
SELECT '-';
SELECT * FROM view_nulls_set;
SELECT '-';
SELECT * FROM view_nulls;

SET join_use_nulls = 0;

SELECT 'join_use_nulls = 0';

SELECT '-';
SELECT * FROM view_no_nulls;
SELECT '-';
SELECT * FROM view_no_nulls_set;
SELECT '-';
SELECT * FROM view_nulls_set;
SELECT '-';
SELECT * FROM view_nulls;

DROP TABLE IF EXISTS view_no_nulls;
DROP TABLE IF EXISTS view_no_nulls_set;
DROP TABLE IF EXISTS view_nulls_set;
DROP TABLE IF EXISTS view_nulls;