mariadb/mysql-test/suite/innodb/r/change_column_collation.result

#
# MDEV-26294 Duplicate entries in unique index not detected when
#	changing collation with INPLACE algorithm
#
SET NAMES utf8;
CREATE TABLE t1 (
id INT PRIMARY KEY,
msg VARCHAR(100) CHARACTER SET utf8 COLLATE utf8_swedish_ci UNIQUE
) ENGINE=INNODB;
INSERT INTO t1 VALUES (1, 'aaa');
INSERT INTO t1 VALUES (2, 'ååå');
ALTER TABLE t1 MODIFY msg VARCHAR(100) CHARACTER SET utf8 COLLATE utf8_unicode_ci, ALGORITHM=inplace;
ERROR 23000: Duplicate entry 'NULL' for key 'msg'
DROP TABLE t1;
CREATE TABLE t1 (
id INT PRIMARY KEY,
msg VARCHAR(100) CHARACTER SET utf8 COLLATE utf8_bin,
id_2 INT not null,
unique index(msg, id_2)
) ENGINE=INNODB;
INSERT INTO t1 VALUES (1, 'aaa', 2);
INSERT INTO t1 VALUES (2, 'AAA', 3);
ALTER TABLE t1 MODIFY msg VARCHAR(100) CHARACTER SET utf8 COLLATE utf8_unicode_ci, ALGORITHM=inplace;
DROP TABLE t1;
CREATE TABLE t1 (
id INT PRIMARY KEY,
msg VARCHAR(100) CHARACTER SET utf8 COLLATE utf8_bin,
unique index(msg)
) ENGINE=INNODB;
INSERT INTO t1 VALUES (1, 'aaa');
INSERT INTO t1 VALUES (2, 'bbb');
INSERT INTO t1 VALUES (3, 'ccc');
SET DEBUG_SYNC = 'RESET';
SET DEBUG_SYNC = 'row_log_apply_before SIGNAL before_apply WAIT_FOR go_ahead';
ALTER TABLE t1 MODIFY msg VARCHAR(100) CHARACTER SET utf8 COLLATE utf8_unicode_ci, ALGORITHM=NOCOPY;
connect  con1,localhost,root,,;
connection con1;
SET DEBUG_SYNC = 'now WAIT_FOR before_apply';
INSERT INTO t1 VALUES (4, 'AAA');
UPDATE t1 set msg = "ddd" where id = 2;
DELETE FROM t1 WHERE id= 3;
SET DEBUG_SYNC = 'now SIGNAL go_ahead';
connection default;
ERROR 23000: Duplicate entry 'NULL' for key 'msg'
SET DEBUG_SYNC = 'RESET';
SELECT * FROM t1;
id	msg
4	AAA
1	aaa
2	ddd
DROP TABLE t1;
CREATE TABLE t1 (
id INT PRIMARY KEY,
msg VARCHAR(100) CHARACTER SET utf8 COLLATE utf8_bin,
unique index(msg)
) ENGINE=INNODB;
INSERT INTO t1 VALUES (1, 'aaa');
SET DEBUG_DBUG="+d,create_index_fail";
SET DEBUG_SYNC="innodb_inplace_alter_table_enter SIGNAL con1_go WAIT_FOR alter_signal";
ALTER TABLE t1 MODIFY msg VARCHAR(100) CHARACTER SET utf8 COLLATE utf8_unicode_ci, ALGORITHM=NOCOPY;
connection con1;
SET DEBUG_SYNC="now WAIT_FOR con1_go";
BEGIN;
SELECT * FROM t1;
id	msg
1	aaa
SET DEBUG_SYNC="now SIGNAL alter_signal";
connection default;
ERROR 23000: Duplicate entry '' for key '*UNKNOWN*'
connection con1;
rollback;
INSERT INTO t1 VALUES(2, 'bbb');
disconnect con1;
connection default;
SET DEBUG_SYNC=reset;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `id` int(11) NOT NULL,
  `msg` varchar(100) CHARACTER SET utf8mb3 COLLATE utf8mb3_bin DEFAULT NULL,
  PRIMARY KEY (`id`),
  UNIQUE KEY `msg` (`msg`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
INSERT INTO t1 VALUES(3, 'ccc');
DROP TABLE t1;
CREATE TABLE t1(id INT PRIMARY KEY, msg VARCHAR(100),
msg_1 VARCHAR(100) AS (msg) VIRTUAL,
msg_2 VARCHAR(100) AS (msg) STORED,
UNIQUE(msg), UNIQUE(msg_1),
UNIQUE(msg_2))ENGINE=InnoDB;
ALTER TABLE t1 MODIFY msg_1 VARCHAR(100) CHARACTER SET utf8
COLLATE utf8_unicode_ci, ALGORITHM=inplace;
ERROR HY000: This is not yet supported for generated columns
ALTER TABLE t1 MODIFY msg_2 VARCHAR(100) CHARACTER SET utf8
COLLATE utf8_unicode_ci, ALGORITHM=inplace;
ERROR 0A000: ALGORITHM=INPLACE is not supported. Reason: Cannot change column type. Try ALGORITHM=COPY
DROP TABLE t1;