config root man

# Create statement with FK on base column of stored column
create table t1(f1 int, f2 int as(f1) stored,
foreign key(f1) references t2(f1) on delete cascade)engine=innodb;
ERROR HY000: Cannot add foreign key constraint
# adding new stored column during alter table copy operation.
create table t1(f1 int primary key);
create table t2(f1 int not null, f2 int as (f1) virtual,
foreign key(f1) references t1(f1) on update cascade)engine=innodb;
alter table t2 add column f3 int as (f1) stored, add column f4 int as (f1) virtual;
ERROR HY000: Error on rename of 'OLD_FILE_NAME' to 'NEW_FILE_NAME' (errno: 150 - Foreign key constraint is incorrectly formed)
drop table t2, t1;
# adding foreign key constraint for base columns during alter copy.
create table t1(f1 int primary key);
create table t2(f1 int not null, f2 int as (f1) stored);
alter table t2 add foreign key(f1) references t1(f1) on update cascade, algorithm=copy;
ERROR HY000: Cannot add foreign key constraint
drop table t2, t1;
# adding foreign key constraint for base columns during online alter.
create table t1(f1 int primary key);
create table t2(f1 int not null, f2 int as (f1) stored);
set foreign_key_checks = 0;
alter table t2 add foreign key(f1) references t1(f1) on update cascade, algorithm=inplace;
ERROR HY000: Cannot add foreign key on the base column of stored column. 
drop table t2, t1;
# adding stored column via online alter.
create table t1(f1 int primary key);
create table t2(f1 int not null,
foreign key(f1) references t1(f1) on update cascade)engine=innodb;
alter table t2 add column f2 int as (f1) stored, algorithm=inplace;
ERROR 0A000: ALGORITHM=INPLACE is not supported for this operation. Try ALGORITHM=COPY.
drop table t2, t1;
set foreign_key_checks = 1;
#
# BUG#26731689 FK ON TABLE WITH GENERATED COLS: ASSERTION POS < N_DEF
#
SET @foreign_key_checks_saved = @@foreign_key_checks;
SET foreign_key_checks=0;
DROP TABLE IF EXISTS s,t;
CREATE TABLE s (a INT, b INT GENERATED ALWAYS AS (0) STORED,  c INT,
d INT GENERATED ALWAYS AS (0) VIRTUAL, e INT) ENGINE=innodb;
CREATE TABLE t (a INT) ENGINE=innodb;
ALTER TABLE s ADD CONSTRAINT c FOREIGN KEY (e) REFERENCES t(a) ON UPDATE SET null;
ERROR HY000: Failed to add the foreign key constaint. Missing index for constraint 'c' in the referenced table 't'
ALTER  TABLE t ADD PRIMARY KEY(a);
ALTER TABLE s ADD CONSTRAINT c FOREIGN KEY (e) REFERENCES t(a) ON UPDATE SET null;
DROP TABLE s,t;
CREATE TABLE s (a INT GENERATED ALWAYS AS (0) VIRTUAL,
b INT GENERATED ALWAYS AS (0) STORED,  c INT) ENGINE=innodb;
CREATE TABLE t (a INT) ENGINE=innodb;
ALTER TABLE s ADD CONSTRAINT c FOREIGN KEY (c) REFERENCES t(a) ON UPDATE SET null;
ERROR HY000: Failed to add the foreign key constaint. Missing index for constraint 'c' in the referenced table 't'
ALTER  TABLE t ADD PRIMARY KEY(a);
ALTER TABLE s ADD CONSTRAINT c FOREIGN KEY (c) REFERENCES t(a) ON UPDATE SET null;
DROP TABLE s,t;
CREATE TABLE s (a INT,  b INT GENERATED ALWAYS AS (0) STORED) ENGINE=innodb;
CREATE TABLE t (a INT PRIMARY KEY) ENGINE=innodb;
ALTER TABLE s ADD CONSTRAINT c FOREIGN KEY (a) REFERENCES t(a) ON UPDATE SET null;
DROP TABLE s,t;
CREATE TABLE s (a INT, b INT) ENGINE=innodb;
CREATE TABLE t (a INT) ENGINE=innodb;
ALTER TABLE s ADD CONSTRAINT c FOREIGN KEY (a) REFERENCES t(a) ON UPDATE SET null;
ERROR HY000: Failed to add the foreign key constaint. Missing index for constraint 'c' in the referenced table 't'
ALTER  TABLE t ADD PRIMARY KEY(a);
ALTER TABLE s ADD CONSTRAINT c FOREIGN KEY (a) REFERENCES t(a) ON UPDATE SET null;
DROP TABLE s,t;
SET @@foreign_key_checks = @foreign_key_checks_saved;