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9a0cbd31ce
ha_innobase::check_if_supported_inplace_alter(): Refuse to change the collation of a column that would become or remain indexed as part of the ALTER TABLE operation. In MariaDB Server 10.6, we will allow this type of operation; that fix depends on MDEV-15250.
19 lines
669 B
Text
19 lines
669 B
Text
#
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# MDEV-26294 Duplicate entries in unique index not detected when
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# changing collation with INPLACE algorithm
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#
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SET NAMES utf8;
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CREATE TABLE t1 (
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id INT PRIMARY KEY,
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msg VARCHAR(100) CHARACTER SET utf8 COLLATE utf8_swedish_ci UNIQUE
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) ENGINE=INNODB;
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INSERT INTO t1 VALUES (1, 'aaa');
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INSERT INTO t1 VALUES (2, 'ååå');
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ALTER TABLE t1
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MODIFY msg VARCHAR(100) CHARACTER SET utf8 COLLATE utf8_unicode_ci,
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ALGORITHM=NOCOPY;
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ERROR 0A000: ALGORITHM=NOCOPY is not supported. Reason: Collation change on an indexed column. Try ALGORITHM=COPY
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ALTER TABLE t1 DROP INDEX msg,
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MODIFY msg VARCHAR(100) CHARACTER SET utf8 COLLATE utf8_unicode_ci,
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ALGORITHM=NOCOPY;
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DROP TABLE t1;
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