select @@ndb_schema_dist_upgrade_allowed;
@@ndb_schema_dist_upgrade_allowed
0
set @@ndb_schema_dist_upgrade_allowed = true;
ERROR HY000: Variable 'ndb_schema_dist_upgrade_allowed' is a read only variable
CREATE TABLE t1(
pk int not null,
a varchar(37) not null
) ENGINE = NDB;
Warnings:
Warning	1296	[mysql.ndb_schema] Could not find expected column 'schema_op_id'
INSERT INTO t1 VALUES(1, "hello");
ALTER TABLE t1 ADD COLUMN b int NULL DEFAULT 24;
Warnings:
Warning	1296	[mysql.ndb_schema] Could not find expected column 'schema_op_id'
Warning	1296	[mysql.ndb_schema] Could not find expected column 'schema_op_id'
ALTER TABLE t1 MODIFY COLUMN b int NOT NULL;
Warnings:
Warning	1296	[mysql.ndb_schema] Could not find expected column 'schema_op_id'
Warning	1296	[mysql.ndb_schema] Could not find expected column 'schema_op_id'
SELECT * FROM t1;
pk	a	b
1	hello	24
DROP TABLE t1;
Warnings:
Warning	1296	[mysql.ndb_schema] Could not find expected column 'schema_op_id'
# restart: --ndb-schema-dist-upgrade-allowed=true --debug=-d,ndb_schema_skip_create_schema_op_id
select @@ndb_schema_dist_upgrade_allowed;
@@ndb_schema_dist_upgrade_allowed
1
CREATE TABLE t1(
pk int not null,
a varchar(37) not null
) ENGINE = NDB;
INSERT INTO t1 VALUES(1, "hello");
ALTER TABLE t1 ADD COLUMN b int NULL DEFAULT 24;
ALTER TABLE t1 MODIFY COLUMN b int NOT NULL;
SELECT * FROM t1;
pk	a	b
1	hello	24
DROP TABLE t1;
Checking mysqld6
CREATE TABLE t1(
pk int not null,
a varchar(37) not null
) ENGINE = NDB;
INSERT INTO t1 VALUES(1, "hello");
ALTER TABLE t1 ADD COLUMN b int NULL DEFAULT 24;
ALTER TABLE t1 MODIFY COLUMN b int NOT NULL;
SELECT * FROM t1;
pk	a	b
1	hello	24
DROP TABLE t1;
Checking mysqld5
CREATE TABLE t1(
pk int not null,
a varchar(37) not null
) ENGINE = NDB;
INSERT INTO t1 VALUES(1, "hello");
ALTER TABLE t1 ADD COLUMN b int NULL DEFAULT 24;
ALTER TABLE t1 MODIFY COLUMN b int NOT NULL;
SELECT * FROM t1;
pk	a	b
1	hello	24
DROP TABLE t1;
Checking mysqld4
CREATE TABLE t1(
pk int not null,
a varchar(37) not null
) ENGINE = NDB;
INSERT INTO t1 VALUES(1, "hello");
ALTER TABLE t1 ADD COLUMN b int NULL DEFAULT 24;
ALTER TABLE t1 MODIFY COLUMN b int NOT NULL;
SELECT * FROM t1;
pk	a	b
1	hello	24
DROP TABLE t1;
Checking mysqld3
CREATE TABLE t1(
pk int not null,
a varchar(37) not null
) ENGINE = NDB;
INSERT INTO t1 VALUES(1, "hello");
ALTER TABLE t1 ADD COLUMN b int NULL DEFAULT 24;
ALTER TABLE t1 MODIFY COLUMN b int NOT NULL;
SELECT * FROM t1;
pk	a	b
1	hello	24
DROP TABLE t1;
Checking mysqld2
CREATE TABLE t1(
pk int not null,
a varchar(37) not null
) ENGINE = NDB;
INSERT INTO t1 VALUES(1, "hello");
ALTER TABLE t1 ADD COLUMN b int NULL DEFAULT 24;
ALTER TABLE t1 MODIFY COLUMN b int NOT NULL;
SELECT * FROM t1;
pk	a	b
1	hello	24
DROP TABLE t1;