Type:
Bug
Priority:
Major
Resolution:
Fixed
Affects Version/s:
10.2(EOL) , 10.3(EOL) , 10.4(EOL) , 10.5 , 10.6 , 10.7(EOL) , 10.8(EOL) , 10.9(EOL)
DROP TABLE IF EXISTS t1;
CREATE TABLE t1 (a CHAR );
ALTER TABLE t1
MODIFY a CHAR COLLATE DEFAULT ,
CONVERT TO CHARACTER SET utf8mb3 COLLATE utf8mb3_bin;
SHOW CREATE TABLE t1;
+-------+--------------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table |
+-------+--------------------------------------------------------------------------------------------------------------------------------+
| t1 | CREATE TABLE `t1` (
`a` char(1) COLLATE utf8mb3_bin DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3 COLLATE=utf8mb3_bin |
+-------+--------------------------------------------------------------------------------------------------------------------------------+
utf8mb3_bin for the column 'a' looks wrong. The ALTER statement asked to use COLLATE DEFAULT for the column "a", which is utf8mb3_general_ci. But COLLATE DEFAULT was erroneously ignored.
Note, if I change the script slightly to ask for:
binary collation on the column level
default collation on the table level
it returns the expected result:
DROP TABLE IF EXISTS t1;
CREATE TABLE t1 (a CHAR );
ALTER TABLE t1
MODIFY a CHAR BINARY ,
CONVERT TO CHARACTER SET utf8mb3 COLLATE utf8mb3_general_ci;
SHOW CREATE TABLE t1;
+-------+----------------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table |
+-------+----------------------------------------------------------------------------------------------------------------------------------+
| t1 | CREATE TABLE `t1` (
`a` char(1) CHARACTER SET utf8mb3 COLLATE utf8mb3_bin DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3 |
+-------+----------------------------------------------------------------------------------------------------------------------------------+
Notice, the BINARY on the column level was not ignored, which is correct.
The first script should be fixed not to ingore COLLATE DEFAULT.
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