#setup tables
create table parent(
a int unique,
b int unique
) engine ndb;
insert into parent values (1, 2), (2, 1);
create table child(
ref int
) engine ndb;
#Testing create FK, using copy algorithm
#cache parent table in server1
select * from parent order by a;
a	b
1	2
2	1
#now run the DDL query in server2
alter table child add
constraint fk1 foreign key(ref) references parent(a),
algorithm = copy;
#check if the parent metadata has been reset in server1
#altering column should fail with error
alter table parent
change column a a varchar(64) not null;
ERROR HY000: Referencing column 'ref' and referenced column 'a' in foreign key constraint 'fk1' are incompatible.
#Testing drop FK, using inplace algorithm
#cache parent table in server1
select * from parent order by a;
a	b
1	2
2	1
#now run the DDL query in server2
alter table child drop foreign key fk1, algorithm=inplace;
#check if the parent metadata has been reset in server1
#altering column should pass
alter table parent
change column a a varchar(64) not null;
#check parent's new definition
show create table parent;
Table	Create Table
parent	CREATE TABLE `parent` (
  `a` varchar(64) NOT NULL,
  `b` int(11) DEFAULT NULL,
  UNIQUE KEY `a` (`a`),
  UNIQUE KEY `b` (`b`)
) ENGINE=ndbcluster DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
#restore parent to old definition
alter table parent change column a a int;
#restore fk for further testing
alter table child add constraint fk1 foreign key(ref) references parent(a);
#Testing drop child table
#cache parent table in server1
select * from parent order by a;
a	b
1	2
2	1
#now run the DDL query in server2
drop table child;
#check if the parent metadata has been reset in server1
#altering column should pass
alter table parent
change column a a varchar(64) not null;
#check parent's new definition
show create table parent;
Table	Create Table
parent	CREATE TABLE `parent` (
  `a` varchar(64) NOT NULL,
  `b` int(11) DEFAULT NULL,
  UNIQUE KEY `a` (`a`),
  UNIQUE KEY `b` (`b`)
) ENGINE=ndbcluster DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
#restore parent to old definition
alter table parent change column a a int;
#Testing create table
#cache parent table in server1
select * from parent order by a;
a	b
1	2
2	1
#now run the DDL query in server2
create table child(
ref int,
constraint fk1 foreign key (ref) references parent(a)
) engine ndb;
#check if the parent metadata has been reset in server1
#altering column should fail with error
alter table parent
change column a a varchar(64) not null;
ERROR HY000: Referencing column 'ref' and referenced column 'a' in foreign key constraint 'fk1' are incompatible.
#Testing multiple alter FK create/drops : I
#cache parent table in server1
select * from parent order by a;
a	b
1	2
2	1
#now run the DDL query in server2
alter table child
drop foreign key fk1,
add constraint fk2 foreign key (ref) references parent(b);
#check if the parent metadata has been reset in server1
#altering column should pass
alter table parent
change column a a varchar(64) not null;
#check parent's new definition
show create table parent;
Table	Create Table
parent	CREATE TABLE `parent` (
  `a` varchar(64) NOT NULL,
  `b` int(11) DEFAULT NULL,
  UNIQUE KEY `a` (`a`),
  UNIQUE KEY `b` (`b`)
) ENGINE=ndbcluster DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
#restore parent to old definition
alter table parent change column a a int;
#setup for child referring multiple parents
create table parent2(
a int unique
) engine ndb;
show create table child;
Table	Create Table
child	CREATE TABLE `child` (
  `ref` int(11) DEFAULT NULL,
  KEY `fk2` (`ref`),
  CONSTRAINT `fk2` FOREIGN KEY (`ref`) REFERENCES `parent` (`b`) ON DELETE NO ACTION ON UPDATE NO ACTION
) ENGINE=ndbcluster DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
alter table child
drop foreign key fk2,
add constraint fk1 foreign key (ref) references parent(a);
#Testing multiple alter FK create/drops : II
#This also tests the fix for Bug#27646160
#Also cache parent2
select * from parent2;
a
#cache parent table in server1
select * from parent order by a;
a	b
1	2
2	1
#now run the DDL query in server2
alter table child
drop foreign key fk1,
add constraint fk2 foreign key (ref) references parent2(a);
#check if the parent metadata has been reset in server1
#altering column should pass
alter table parent
change column a a varchar(64) not null;
#check parent's new definition
show create table parent;
Table	Create Table
parent	CREATE TABLE `parent` (
  `a` varchar(64) NOT NULL,
  `b` int(11) DEFAULT NULL,
  UNIQUE KEY `a` (`a`),
  UNIQUE KEY `b` (`b`)
) ENGINE=ndbcluster DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
#restore parent to old definition
alter table parent change column a a int;
#altering column in parent2 should fail with error
flush tables parent2;
alter table parent2
change column a a varchar(64) not null;
ERROR HY000: Referencing column 'ref' and referenced column 'a' in foreign key constraint 'fk2' are incompatible.
#setup to test drop database
drop table child;
create database test1;
create table test1.child(
ref1 int,
ref2 int,
foreign key fk1(ref1) references test.parent(a),
foreign key fk2(ref2) references test.parent2(a)
) engine ndb;
#Testing drop database
#cache parent2
select * from parent2;
a
#cache parent table in server1
select * from parent order by a;
a	b
1	2
2	1
#now run the DDL query in server2
drop database test1;
#check if the parent metadata has been reset in server1
#altering column should pass
alter table parent
change column a a varchar(64) not null;
#check parent's new definition
show create table parent;
Table	Create Table
parent	CREATE TABLE `parent` (
  `a` varchar(64) NOT NULL,
  `b` int(11) DEFAULT NULL,
  UNIQUE KEY `a` (`a`),
  UNIQUE KEY `b` (`b`)
) ENGINE=ndbcluster DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
#restore parent to old definition
alter table parent change column a a int;
#altering column in parent2 should also pass
flush tables parent2;
alter table parent2
change column a a varchar(64) not null;
#cleanup
drop table parent, parent2;
#setup to test mock table resolution
set foreign_key_checks=0;
create table child (
a int,
foreign key fk1(a) references parent(a)
) engine ndb;
create table parent (
a int unique
) engine ndb;
insert into parent values (1), (2);
set foreign_key_checks=1;
#Now drop child and test
#cache parent table in server1
select * from parent order by a;
a
1
2
#now run the DDL query in server2
drop table child;
#check if the parent metadata has been reset in server1
#altering column should pass
alter table parent
change column a a varchar(64) not null;
#check parent's new definition
show create table parent;
Table	Create Table
parent	CREATE TABLE `parent` (
  `a` varchar(64) NOT NULL,
  UNIQUE KEY `a` (`a`)
) ENGINE=ndbcluster DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
#restore parent to old definition
alter table parent change column a a int;
#cleanup
drop table parent;