Read-only table with ROW_FORMAT=COMPRESSED is still updateable through foreign key cascade

--source include/have_innodb.inc

create table t1 (pk int primary key) engine=InnoDB;

insert into t1 values (1),(2),(3);

set global innodb_read_only_compressed= off;

create table t2 (a int, foreign key (a) references t1(pk) on update cascade on delete cascade) engine=InnoDB row_format=compressed;

insert into t2 values (1),(2),(3);

set global innodb_read_only_compressed= on;

update t1 set pk = 10 where pk = 1;

delete from t1 where pk = 2;

select * from t2;

# Cleanup

drop table t2, t1;

update t1 set pk = 10 where pk = 1;

delete from t1 where pk = 2;

select * from t2;

a

3

10