# 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. Instead of implicitly refusing to modify the
# PRIMARY KEY column c1 from NOT NULL to NULL, we now get an error for this
# operation with the patch for Bug#16545198.
--error ER_PRIMARY_CANT_HAVE_NULL
ALTER TABLE t CHANGE c1 c1 INT NULL FIRST, ALGORITHM=INPLACE;

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

# 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,,);
connection con1;


--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_TABLES
WHERE NAME='test/t';

DROP TABLE t;

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

# 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