--source include/innodb_page_size.inc

# Save the initial number of concurrent sessions.
--source include/count_sessions.inc

CREATE TABLE t (c1 INT PRIMARY KEY, c2 INT NOT NULL, c3 INT) ENGINE=InnoDB;
INSERT INTO t VALUES (1,2,3),(4,5,6),(7,8,9);

--enable_info
# This one will be a no-op.
# MySQL should perhaps issue an error, because it refuses to modify
# the PRIMARY KEY column c1 from NOT NULL to NULL.
ALTER TABLE t CHANGE c1 c1 INT NULL FIRST, ALGORITHM=INPLACE;

# NULL -> NOT NULL only allowed INPLACE if strict sql_mode is on.
ALTER TABLE t MODIFY c3 INT NOT NULL, ALGORITHM=INPLACE;

# Request some conflicting changes for a single column.
--error ER_BAD_FIELD_ERROR
ALTER TABLE t CHANGE c2 c2 INT, CHANGE c2 c2 INT NOT NULL;
--error ER_BAD_FIELD_ERROR
ALTER TABLE t MODIFY c2 INT, MODIFY c2 INT NOT NULL;
--error ER_BAD_FIELD_ERROR
ALTER TABLE t MODIFY c2 INT UNSIGNED, MODIFY c2 INT;
--error ER_BAD_FIELD_ERROR
ALTER TABLE t MODIFY c2 CHAR(1) NOT NULL, MODIFY c2 INT NOT NULL;

# No-ops.
ALTER TABLE t CHANGE c2 c2 INT NOT NULL;
ALTER TABLE t MODIFY c2 INT NOT NULL;
--disable_info

connect (con1,localhost,root,,);

--error ER_BAD_NULL_ERROR
UPDATE t SET c2=NULL;

SELECT * FROM t;

connection default;

# This should change the column to NULL.
ALTER TABLE t MODIFY c2 INT, ALGORITHM=INPLACE;

connection con1;
BEGIN;
UPDATE t SET c2=NULL;
SELECT * FROM t;
ROLLBACK;
SELECT * FROM t;

disconnect con1;
connection default;

# This should be no-op.
ALTER TABLE t MODIFY c2 INT NULL, ALGORITHM=INPLACE;

--replace_column 1 # 5 #
SELECT * FROM INFORMATION_SCHEMA.INNODB_SYS_TABLES
WHERE NAME='test/t';

DROP TABLE t;

CREATE TABLE t1(c1 INT) ENGINE=InnoDB;
ALTER TABLE t1 ADD CONSTRAINT UNIQUE KEY i1(c1);
ALTER TABLE t1 CHANGE c1 c1 INT NOT NULL,ADD KEY(c1);
DROP TABLE t1;

--echo #
--echo # MDEV-18732 InnoDB: ALTER IGNORE returns error for NULL
--echo #

CREATE TABLE t1(c INT) ENGINE=InnoDB;
INSERT INTO t1 VALUES (NULL);
--enable_info
ALTER IGNORE TABLE t1 MODIFY c INT NOT NULL;
--disable_info
--error ER_BAD_NULL_ERROR
INSERT INTO t1 VALUES (NULL);
SELECT * FROM t1;
DROP TABLE t1;

CREATE TABLE t1(c INT) ENGINE=InnoDB;
INSERT INTO t1 VALUES (NULL),(1),(1);
--enable_info
ALTER IGNORE TABLE t1 ADD UNIQUE(c);
ALTER IGNORE TABLE t1 ADD PRIMARY KEY(c);
--disable_info
SELECT * FROM t1;
DROP TABLE t1;

CREATE TABLE t1(c INT, g INT AS (c) PERSISTENT) ENGINE=InnoDB;
CREATE TABLE t2(c INT, v INT AS (c) VIRTUAL) ENGINE=InnoDB;
CREATE TABLE t3(c INT, v INT AS (c) VIRTUAL, INDEX(v)) ENGINE=InnoDB;
INSERT INTO t1 SET c=NULL;
INSERT INTO t2 SET c=NULL;
INSERT INTO t3 SET c=NULL;
SET @old_sql_mode = @@sql_mode;
# Allow lossy conversions of data
SET sql_mode = '';
--enable_info
ALTER TABLE t1 MODIFY c INT NOT NULL;
ALTER TABLE t2 MODIFY c INT NOT NULL;
ALTER TABLE t3 MODIFY c INT NOT NULL;
--disable_info
SET sql_mode = @old_sql_mode;
SELECT * FROM t1;
SELECT * FROM t2;
SELECT * FROM t3;
SELECT v FROM t3 FORCE INDEX(v);
CHECK TABLE t1,t2,t3;
DROP TABLE t1,t2,t3;

CREATE TABLE t1(c INT, g INT AS (c) PERSISTENT) ENGINE=InnoDB;
CREATE TABLE t2(c INT, v INT AS (c) VIRTUAL) ENGINE=InnoDB;
CREATE TABLE t3(c INT, v INT AS (c) VIRTUAL, INDEX(v)) ENGINE=InnoDB;
INSERT INTO t1 SET c=NULL;
INSERT INTO t2 SET c=NULL;
INSERT INTO t3 SET c=NULL;
--enable_info
ALTER IGNORE TABLE t1 MODIFY c INT NOT NULL;
ALTER IGNORE TABLE t2 MODIFY c INT NOT NULL;
ALTER IGNORE TABLE t3 MODIFY c INT NOT NULL;
--disable_info
SELECT * FROM t1;
SELECT * FROM t2;
SELECT * FROM t3;
SELECT v FROM t3 FORCE INDEX(v);
CHECK TABLE t1,t2,t3;
DROP TABLE t1,t2,t3;

CREATE TABLE t1(c INT, g INT AS (c) PERSISTENT) ENGINE=InnoDB;
CREATE TABLE t2(c INT, v INT AS (c) VIRTUAL) ENGINE=InnoDB;
CREATE TABLE t3(c INT, v INT AS (c) VIRTUAL, INDEX(v)) ENGINE=InnoDB;
INSERT INTO t1 SET c=NULL;
INSERT INTO t2 SET c=NULL;
INSERT INTO t3 SET c=NULL;
--enable_info
--error ER_INVALID_USE_OF_NULL
ALTER TABLE t1 MODIFY c INT NOT NULL;
--error ER_INVALID_USE_OF_NULL
ALTER TABLE t2 MODIFY c INT NOT NULL;
--error WARN_DATA_TRUNCATED
ALTER TABLE t3 MODIFY c INT NOT NULL;
--disable_info
UPDATE t1 SET c=0;
UPDATE t2 SET c=0;
UPDATE t3 SET c=0;
--enable_info
ALTER TABLE t1 MODIFY c INT NOT NULL;
ALTER TABLE t2 MODIFY c INT NOT NULL;
--echo # MDEV-18819 FIXME: This should not require ALGORITHM=COPY.
ALTER TABLE t3 MODIFY c INT NOT NULL;
--disable_info
SELECT * FROM t1;
SELECT * FROM t2;
SELECT * FROM t3;
DROP TABLE t1,t2,t3;

# Check that all connections opened by test cases in this file are really
# gone so execution of other tests won't be affected by their presence.
--source include/wait_until_count_sessions.inc