Both (WHERE 0.1) and (WHERE NOT 0.1) return empty set

DROP TABLE IF EXISTS t1;

CREATE TABLE t1 (a INT);

INSERT INTO t1 VALUES (10);

SELECT CASE WHEN 0.1 THEN 'TRUE' ELSE 'FALSE' END FROM t1;

+--------------------------------------------+

| CASE WHEN 0.1 THEN 'TRUE' ELSE 'FALSE' END |

+--------------------------------------------+

| TRUE                                       |

+--------------------------------------------+

SELECT * FROM t1 WHERE 0.1;

Empty set (0.00 sec)

SELECT * FROM t1 WHERE NOT 0.1;

Empty set (0.00 sec)