Details
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Bug
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Status: Stalled (View Workflow)
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Major
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Resolution: Unresolved
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10.0.10, 10.2, 10.3
Description
mysql> SET NAMES utf8;
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Query OK, 0 rows affected (0.00 sec)
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mysql> SELECT hex('��'), char_length('��'), octet_length('��');
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+-------------+---------------------+----------------------+
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| hex('��') | char_length('��') | octet_length('��') |
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+-------------+---------------------+----------------------+
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| F09F9881 | 4 | 4 |
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+-------------+---------------------+----------------------+
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1 row in set (0.00 sec)
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Notice, I use "SET NAMES utf8" (which is a 3-byte character set
and supports only BMP characters), but then input a 4-byte character.
The result of CHAR_LENGTH() is wrong.
0xF09F9881 is a wrong byte sequence of utf8 (it's correct for utf8mb4 only)
The expected result would be:
- either return error for the entire query
- or replace the character to '?' and thus make CHAR_LENGTH() return 1.
Attachments
Issue Links
- relates to
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MDEV-6643 Improve performance of string processing in the parser
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- Stalled
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