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  1. MariaDB Server
  2. MDEV-6627

QUOTE() does not work well with unassigned characters

        Details

        • Type: Bug
        • Status: Open
        • Priority: Minor
        • Resolution: Unresolved
        • Affects Version/s: 5.3.12, 5.5.39, 10.0.13
        • Fix Version/s: 10.0
        • Component/s: None
        • Labels:
          None

          Description

          MariaDB [test]> SELECT HEX(_big5 0xC840), HEX(QUOTE(_big5 0xC840));
+-------------------+--------------------------+
| HEX(_big5 0xC840) | HEX(QUOTE(_big5 0xC840)) |
+-------------------+--------------------------+
| C840              | NULL                     |
+-------------------+--------------------------+
1 row in set (0.00 sec)

          The result for in the second column is wrong.
          The expected result is C840, similar to the first column.

          The problem happens because Item_func_quote::val_str()
          uses an mb_wc()..wc_mb() loop, which breaks and returns
          null on unassigned characters.

          The loop should be fixed to use a native non-Unicode API instead, e.g. ismbchar().

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

                    • Created:
                      Updated: