#
# 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=NOCOPY;
ERROR 0A000: ALGORITHM=NOCOPY is not supported. Reason: Collation change on an indexed column. Try ALGORITHM=COPY
ALTER TABLE t1 DROP INDEX msg,
MODIFY msg VARCHAR(100) CHARACTER SET utf8 COLLATE utf8_unicode_ci,
ALGORITHM=NOCOPY;
DROP TABLE t1;