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  1. MariaDB Server
  2. MDEV-6557

INFORMATION_SCHEMA.COLLATION_PROPERTIES

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    • Task
    • Status: Open (View Workflow)
    • Minor
    • Resolution: Unresolved
    • None
    • None
    • None

    Description

      We'll introduce a new table INFORMATION_SCHENA.COLLATION_PROPERTIES with
      the following structure:

      CREATE TABLE INFORMATION_SCHEMA.COLLATION_PROPERTIES
      {
        ID INT NOT NULL,
        TAILORING TEXT CHARACTER SET utf8,
        USE_COUNT BIGINT NOT NULL
      };

      Column description

      • The column TAILORING will return collation definition rules for UCA based
        collations (as defined in strings/ctype-uca.c or in Index.xml) and NULL for non-UCA collations. For example:

        MariaDB [test]> SELECT TAILORING FROM INFORMATION_SCHEMA.COLLATIONS WHERE ID=202;
        +-----------------------------------------------------+
        | TAILORING                                           |
        +-----------------------------------------------------+
        | & C < \u010D <<< \u010C ... & Z < \u017E <<< \u017D |
        +-----------------------------------------------------+

      • The column USE_COUNT will contain collation usage statistics,
        similar to what was previously added into INFORMATION_SCHEMA.PLUGINS
        under terms of MDEV-6274. Unlike I_S.PLUGINS (which exists only if the
        feedback plugins is loaded into the server), the new table
        INFORMATION_SCHEMA.COLLATION_PROPERTIES will always
        exist, thus the column USE_COUNT will give an alternative always available
        access to the collation usage statistics.
      • In the future there will be more fields for other properties,
        like case sensitivity, accent sensitivity, Kana sensitivity,
        Unicode version, number of levels for comparison and sort, etc.

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              Unassigned Unassigned
              bar Alexander Barkov
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                Created:
                Updated:

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