create table parent (
a int primary key auto_increment,
b int not null,
c int not null,
unique(b) using hash,
index(c)) engine = ndb;
create table child (
a int primary key auto_increment,
b int not null,
c int not null,
unique(b) using hash,
index(c)) engine = ndb;
create table blobchild (
a int primary key auto_increment,
b int not null,
c int not null,
d text,
unique(b) using hash,
index(c)) engine = ndb;
alter table blobchild add constraint fkbad foreign key(a) references parent (a) on delete cascade on update restrict;
ERROR HY000: Cannot add foreign key constraint
show warnings;
Level	Code	Message
Warning	1296	Got error 21034 'Create foreign key failed - child table has Blob or Text column and on-delete-cascade is not allowed' from NDB
Error	1215	Cannot add foreign key constraint
alter table child add constraint fkname foreign key (a) references parent (a) on delete cascade on update restrict;
insert into parent values (1,1,1),(2,2,2);
insert into child values (1,1,1),(2,2,2);
insert into child values (3,3,3);
ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`child`, CONSTRAINT `fkname` FOREIGN KEY (`a`) REFERENCES `parent` (`a`) ON DELETE CASCADE ON UPDATE RESTRICT)
begin;
delete from parent where a = 1;
select * from child order by 1,2,3;
a	b	c
2	2	2
commit;
delete from child;
delete from parent;
alter table child drop foreign key fkname;
alter table blobchild add constraint fkbad foreign key(b) references parent (a) on delete cascade on update restrict;
ERROR HY000: Cannot add foreign key constraint
show warnings;
Level	Code	Message
Warning	1296	Got error 21034 'Create foreign key failed - child table has Blob or Text column and on-delete-cascade is not allowed' from NDB
Error	1215	Cannot add foreign key constraint
alter table child add constraint fkname foreign key (b) references parent (a) on delete cascade on update restrict;
insert into parent values (1,1,1),(2,2,2);
insert into child values (1,1,1),(2,2,2);
insert into child values (3,3,3);
ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`child`, CONSTRAINT `fkname` FOREIGN KEY (`b`) REFERENCES `parent` (`a`) ON DELETE CASCADE ON UPDATE RESTRICT)
update child set b = 3 where a = 1;
ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`child`, CONSTRAINT `fkname` FOREIGN KEY (`b`) REFERENCES `parent` (`a`) ON DELETE CASCADE ON UPDATE RESTRICT)
begin;
delete from parent where a = 1;
select * from child order by 1,2,3;
a	b	c
2	2	2
commit;
delete from child;
delete from parent;
alter table child drop foreign key fkname;
alter table blobchild add constraint fkbad foreign key(a) references parent (b) on delete cascade on update restrict;
ERROR HY000: Cannot add foreign key constraint
show warnings;
Level	Code	Message
Warning	1296	Got error 21034 'Create foreign key failed - child table has Blob or Text column and on-delete-cascade is not allowed' from NDB
Error	1215	Cannot add foreign key constraint
alter table child add constraint fkname foreign key (a) references parent (b) on delete cascade on update restrict;
insert into parent values (1,1,1),(2,2,2);
insert into child values (1,1,1),(2,2,2);
insert into child values (3,3,3);
ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`child`, CONSTRAINT `fkname` FOREIGN KEY (`a`) REFERENCES `parent` (`b`) ON DELETE CASCADE ON UPDATE RESTRICT)
update parent set b = 3 where a = 1;
ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`child`, CONSTRAINT `fkname` FOREIGN KEY (`a`) REFERENCES `parent` (`b`) ON DELETE CASCADE ON UPDATE RESTRICT)
begin;
delete from parent where a = 1;
select * from child order by 1,2,3;
a	b	c
2	2	2
commit;
delete from child;
delete from parent;
alter table child drop foreign key fkname;
alter table blobchild add constraint fkbad foreign key(b) references parent (b) on delete cascade on update restrict;
ERROR HY000: Cannot add foreign key constraint
show warnings;
Level	Code	Message
Warning	1296	Got error 21034 'Create foreign key failed - child table has Blob or Text column and on-delete-cascade is not allowed' from NDB
Error	1215	Cannot add foreign key constraint
alter table child add constraint fkname foreign key (b) references parent (b) on delete cascade on update restrict;
insert into parent values (1,1,1),(2,2,2);
insert into child values (1,1,1),(2,2,2);
update child set b = 3 where a = 1;
ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`child`, CONSTRAINT `fkname` FOREIGN KEY (`b`) REFERENCES `parent` (`b`) ON DELETE CASCADE ON UPDATE RESTRICT)
insert into child values (3,3,3);
ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`child`, CONSTRAINT `fkname` FOREIGN KEY (`b`) REFERENCES `parent` (`b`) ON DELETE CASCADE ON UPDATE RESTRICT)
update parent set b = 3 where a = 1;
ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`child`, CONSTRAINT `fkname` FOREIGN KEY (`b`) REFERENCES `parent` (`b`) ON DELETE CASCADE ON UPDATE RESTRICT)
begin;
delete from parent where a = 1;
select * from child order by 1,2,3;
a	b	c
2	2	2
commit;
delete from child;
delete from parent;
alter table child drop foreign key fkname;
alter table blobchild add constraint fkbad foreign key(c) references parent (a) on delete cascade on update restrict;
ERROR HY000: Cannot add foreign key constraint
show warnings;
Level	Code	Message
Warning	1296	Got error 21034 'Create foreign key failed - child table has Blob or Text column and on-delete-cascade is not allowed' from NDB
Error	1215	Cannot add foreign key constraint
alter table child add constraint fkname foreign key (c) references parent (a) on delete cascade on update restrict;
insert into parent values (1,1,1),(2,2,2);
insert into child values (1,1,1),(2,2,2);
update child set c = 3 where a = 1;
ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`child`, CONSTRAINT `fkname` FOREIGN KEY (`c`) REFERENCES `parent` (`a`) ON DELETE CASCADE ON UPDATE RESTRICT)
insert into child values (3,3,3);
ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`child`, CONSTRAINT `fkname` FOREIGN KEY (`c`) REFERENCES `parent` (`a`) ON DELETE CASCADE ON UPDATE RESTRICT)
begin;
delete from parent where a = 1;
select * from child order by 1,2,3;
a	b	c
2	2	2
commit;
delete from child;
delete from parent;
alter table child drop foreign key fkname;
alter table blobchild add constraint fkbad foreign key(c) references parent (b) on delete cascade on update restrict;
ERROR HY000: Cannot add foreign key constraint
show warnings;
Level	Code	Message
Warning	1296	Got error 21034 'Create foreign key failed - child table has Blob or Text column and on-delete-cascade is not allowed' from NDB
Error	1215	Cannot add foreign key constraint
alter table child add constraint fkname foreign key (c) references parent (b) on delete cascade on update restrict;
insert into parent values (1,1,1),(2,2,2);
insert into child values (1,1,1),(2,2,2);
update child set c = 3 where a = 1;
ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`child`, CONSTRAINT `fkname` FOREIGN KEY (`c`) REFERENCES `parent` (`b`) ON DELETE CASCADE ON UPDATE RESTRICT)
insert into child values (3,3,3);
ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`child`, CONSTRAINT `fkname` FOREIGN KEY (`c`) REFERENCES `parent` (`b`) ON DELETE CASCADE ON UPDATE RESTRICT)
update parent set b = 3 where a = 1;
ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`child`, CONSTRAINT `fkname` FOREIGN KEY (`c`) REFERENCES `parent` (`b`) ON DELETE CASCADE ON UPDATE RESTRICT)
begin;
delete from parent where a = 1;
select * from child order by 1,2,3;
a	b	c
2	2	2
commit;
insert into parent values (1,1,1);
insert into child values (1,1,1);
insert into child select a+2,a+2,1+(a % 2) from child;
insert into child select a+4,a+4,1+(a % 2) from child;
insert into child select a+8,a+8,1+(a % 2) from child;
insert into child select a+16,a+16,1+(a % 2) from child;
insert into child select a+32,a+32,1+(a % 2) from child;
insert into child select a+64,a+64,1+(a % 2) from child;
select c, count(*) from child
group by c
order by 1,2;
c	count(*)
1	64
2	64
delete from parent where a = 1;
select c, count(*) from child
group by c
order by 1,2;
c	count(*)
2	64
delete from parent where a = 2;
delete from child;
delete from parent;
alter table child drop foreign key fkname;
drop table parent, child, blobchild;