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  1. MariaDB Server
  2. MDEV-20604

Duplicate key value is silently truncated to 64 characters in print_keydup_error

Details

    Description

      When a duplicate key is encountered, the error message is constructed in print_keydup_error:

      https://github.com/MariaDB/server/blob/mariadb-10.2.27/sql/handler.cc#L3450

      The duplicate value is silently truncated to 64 characters. This is because the format string for the error message sets the field width to 64:

      https://github.com/MariaDB/server/blob/mariadb-10.2.27/sql/share/errmsg-utf8.txt#L6166

      Truncation is probably fine, but since this specific error involves a "duplicate key", it can be a bit confusing if the user searches the table for that string, and then doesn't find another row with that specific value.

      If we can't print the whole value, then the error message may want to mention that the string may be truncated to 64 characters.

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          causes

          Bug - A problem which impairs or prevents the functions of the product. MDEV-22147 main.mysqldump fails with wrong result (truncated output)

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-22545 my_vsnprintf behaves not as in C standard

          • Blocker - Blocks development and/or testing work, production could not run.
          • Closed
          relates to

          Bug - A problem which impairs or prevents the functions of the product. MDEV-20605 Awaken transaction can miss inserted by other transaction records due to wrong persistent cursor restoration

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-20628 If temporary error occurs with optimistic mode of parallel replication, error message has false information

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed

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            People

              sanja Oleksandr Byelkin
              GeoffMontee Geoff Montee (Inactive)
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                Resolved:

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