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  1. MariaDB Server
  2. MDEV-6688

Illegal mix of collation with bit string B'01100001'

        Details

        • Type: Bug
        • Status: Closed
        • Priority: Major
        • Resolution: Fixed
        • Affects Version/s: 5.3.12, 5.5.39, 10.0.13
        • Fix Version/s: 10.0.14
        • Component/s: None
        • Labels:
          None

          Description

          DROP TABLE IF EXISTS t1;
CREATE TABLE t1 (a VARCHAR(10) CHARACTER SET latin1, b INT);
INSERT INTO t1 VALUES ('a',1);
SELECT CONCAT(a, IF(b>10, _utf8 X'61', _utf8 X'61')) FROM t1;
SELECT CONCAT(a, IF(b>10, _utf8 X'61', _utf8 B'01100001')) FROM t1;

          returns correct output for the first SELECT:

          MariaDB [test]> SELECT CONCAT(a, IF(b>10, _utf8 X'61', _utf8 X'61')) FROM t1;
+-----------------------------------------------+
| CONCAT(a, IF(b>10, _utf8 X'61', _utf8 X'61')) |
+-----------------------------------------------+
| aa                                            |
+-----------------------------------------------+
1 row in set (0.00 sec

          but returns an error for the second SELECT:

          MariaDB [test]> SELECT CONCAT(a, IF(b>10, _utf8 X'61', _utf8 B'01100001')) FROM t1;
ERROR 1267 (HY000): Illegal mix of collations (latin1_swedish_ci,IMPLICIT) and (utf8_general_ci,COERCIBLE) for operation 'concat'

          The second query should be fixed to return a result,
          because _utf8 X'61' and _utf8 B'01100001' are actually
          the same values representing Latin small letter 'a':

          MariaDB [test]> SELECT _utf8 X'61', _utf8 B'01100001';
+-------------+-------------------+
| _utf8 X'61' | _utf8 B'01100001' |
+-------------+-------------------+
| a           | a                 |
+-------------+-------------------+
1 row in set (0.00 sec)

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                  • Assignee:
                    bar Alexander Barkov
                    Reporter:
                    bar Alexander Barkov
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                    Dates

                    • Created:
                      Updated:
                      Resolved: