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  1. MariaDB Server
  2. MDEV-8686

A user defined collation utf8_confusables doesn't work

Details

    • Bug
    • Status: Closed (View Workflow)
    • Major
    • Resolution: Fixed
    • 10.0(EOL), 10.1(EOL), 10.2(EOL)
    • 10.1.15
    • Character Sets
    • None

    Description

      The collation defined in the attached Index.xml does not work.
      It crashes in DEBUG build and writes "Expansion too long" error to server error log in release build.

      I seems the problem happens because MariaDB collation customization currently has some limitation in shifting characters which have implicit weights (i.e. those not listed on DUCET).

      Attachments

        1. Index.xml
          161 kB
          Alexander Barkov

        Activity

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          bar Alexander Barkov added a comment -

          How to repeat:

          • Put the attatched Index.xml into share/charsets
          • Run this query: 

            SELECT _utf8'a' COLLATE utf8_confusables;

          bar Alexander Barkov added a comment - How to repeat: Put the attatched Index.xml into share/charsets Run this query: SELECT _utf8 'a' COLLATE utf8_confusables;
          bar Alexander Barkov added a comment -

          The problem is the the collation customization code does not handle:

          • reset to a character with an implicit weight
          • shift of a character with an implicit weight
          bar Alexander Barkov added a comment - The problem is the the collation customization code does not handle: reset to a character with an implicit weight shift of a character with an implicit weight

          People

            bar Alexander Barkov
            bar Alexander Barkov
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            Dates

              Created:
              Updated:
              Resolved:

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