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Bug
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Major
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Resolution:
Fixed
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10.3(EOL), 10.4(EOL), 10.5, 10.6, 10.7(EOL), 10.8(EOL), 10.9(EOL)
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It's impossible to convert a table to some character set, but at the same time set the DEFAULT character set to another character set:
ALTER TABLE t1 CONVERT TO CHARACTER SET utf8mb3, DEFAULT CHARACTER SET utf8mb4;
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ERROR 1302 (HY000): Conflicting declarations: 'CHARACTER SET utf8mb3' and 'CHARACTER SET utf8mb4'
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The problem happens because the code handling both clauses uses HA_CREATE_INFO::default_table_charset to check conflicting declarations.
The test for conflicts was added by MDEV-7387. Before MDEV-7387 it worked even worse:
ALTER TABLE t1 CHARACTER SET utf8, CONVERT TO CHARACTER SET latin1;
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ignored the utf8 part and just use the latin1 part for both conversion and DEFAULT.
It should be fixed to allow any combinations of cs1/cl1 and cs2/cs2 in:
- [DEFAULT] CHARACTER SET cs1 [COLLATE cl1], and
- CONVERT TO CHARACTER SET cs2 [COLLATE cs2]
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