spider inconsistent pushdown of STRAIGHT_JOIN as a hint vs as join operators

CREATE SERVER srv FOREIGN DATA WRAPPER mysql

OPTIONS (SOCKET "$MASTER_1_MYSOCK", DATABASE 'test',user 'root');

create table t2 (c int, index i(c));

create table t1 (c int, index i(c)) ENGINE=Spider

COMMENT='WRAPPER "mysql", srv "srv",TABLE "t2"';

Warnings:

Warning	138	Spider table params in COMMENT or CONNECTION strings have been deprecated and will be removed in a future release. Please use table options instead.

explain select STRAIGHT_JOIN * from t1 t3, t1 t4 where t3.c > t4.c;

id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra

1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Storage engine handles GROUP BY

select STRAIGHT_JOIN * from t1 t3, t1 t4 where t3.c > t4.c;

c	c

explain select * from t1 t3 STRAIGHT_JOIN t1 t4 on t3.c > t4.c;

id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra

1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Storage engine handles GROUP BY

select * from t1 t3 STRAIGHT_JOIN t1 t4 on t3.c > t4.c;

c	c

SELECT argument FROM mysql.general_log WHERE argument LIKE 'select %';

argument

select STRAIGHT_JOIN * from t1 t3, t1 t4 where t3.c > t4.c

select t0.`c` `c`,t1.`c` `c` from `test`.`t2` t0 join `test`.`t2` t1 where (t0.`c` > t1.`c`)

select * from t1 t3 STRAIGHT_JOIN t1 t4 on t3.c > t4.c

select t0.`c` `c`,t1.`c` `c` from `test`.`t2` t0 straight_join `test`.`t2` t1 where (t0.`c` > t1.`c`)

SELECT argument FROM mysql.general_log WHERE argument LIKE 'select %'