straight_join ignoring impossible condition

CREATE TABLE t10(a int);

CREATE TABLE t20(c0 REAL UNSIGNED, PRIMARY KEY(c0));

insert into t10 values (1);

insert into t20 values (0);

SELECT 1 FROM t10 JOIN t20 ON (t20.c0 = '-1');

SELECT 1 FROM t10 STRAIGHT_JOIN t20 ON (t20.c0 = '-1');

DROP TABLE t10, t20;