Oracle outer join syntax (+): operator (+) is not processed in condition like "(t2.b(+) , t1.b) in (select ...)"

Operator (+) is not processed in condition like "(t2.b(+) , t1.b) in (select ...)":

no warnings about ignoring the operator, no conversion

create table t1 ( c int, b char(1)) ;

insert into t1 values (1,'b');

create tablet2 ( a int  , b char(1)) ;

insert into t2 values (1,'a');

create table t3 (c1 char(1), c2 char(2));

insert into t3 values ('c','d');

insert into t3 values ('c','d');

EXPLAIN EXTEDED SELECT t2.b

FROM t1, t2 WHERE t1.c = t2.a(+) AND (t2.b(+), t1.b) IN (SELECT * from t3);

CREATE VIEW v1 AS

SELECT t2.b

FROM t1 , t2 WHERE t1.c = t2.a(+) AND (t2.b(+), t1.b) IN (SELECT * from t3);

SHOW CREATE VIEW v1;

drop view v1;

drop tables t1,t2,t3;

EXPLAIN EXTENDED SELECT t2.b

FROM t1, t2 WHERE t1.c = t2.a(+) AND (t2.b(+),t1.b) IN (SELECT * from t3);

id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra

1	PRIMARY	t1	system	NULL	NULL	NULL	NULL	1	100.00	

1	PRIMARY	t2	system	NULL	NULL	NULL	NULL	1	100.00	

1	PRIMARY	t3	ALL	NULL	NULL	NULL	NULL	2	50.00	Using where; FirstMatch(t2)

Warnings:

Note	1003	select 'a' AS "b" from ("test"."t3") where "test"."t3"."c1" = 'a' and 'b' = "test"."t3"."c2"

TYPE=VIEW

query=select `test`.`t2`.`b` AS `b` from (`test`.`t1` left join `test`.`t2` on(`test`.`t1`.`c` = `test`.`t2`.`a`)) where (`test`.`t2`.`b` (+),`test`.`t1`.`b`) in (select `test`.`t3`.`c1`,`test`.`t3`.`c2` from `test`.`t3`)

md5=4c521307514facea9e1188052ae7c5fa

updatable=0

algorithm=0

definer_user=root

definer_host=localhost

suid=2

with_check_option=0

timestamp=0001748341172721182

create-version=2

source=SELECT t2.b\nFROM t1 , t2 WHERE t1.c = t2.a(+) AND (t2.b(+),t1.b) IN (SELECT * from t3)

client_cs_name=latin1

connection_cl_name=latin1_swedish_ci

view_body_utf8=select `test`.`t2`.`b` AS `b` from (`test`.`t1` left join `test`.`t2` on(`test`.`t1`.`c` = `test`.`t2`.`a`)) where (`test`.`t2`.`b` (+),`test`.`t1`.`b`) in (select `test`.`t3`.`c1`,`test`.`t3`.`c2` from `test`.`t3`)

mariadb-version=120001