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  1. MariaDB Server
  2. MDEV-4913

External ENUM Field definition

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    • Task
    • Status: Open (View Workflow)
    • Minor
    • Resolution: Unresolved
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    Description

      Based in a table, KEY-VALUE, we could expand the ENUM field from limited size (65535 values) to a unlimited size (64bits), this is a new field type

      ENUM_EXTERNAL(database,table,key column,value column)

      the internal value of ENUM_EXTERNAL is a bigint, the string representation is a blob (or maybe a varchar(255) or a text)

      the point is:

      the storage engine will save a bitint
      the mysql core will convert the STRING to BIGINT using the database/table/key column/value, using a SELECT like this:

      SELECT <value_column> FROM <database>.<table> WHERE <value_column>="FIELD VALUE SEND VIA INSERT/UPDATE/DELETE"
      UNION
      SELECT <key_column> FROM <database>.<table> WHERE <key_column>="FIELD VALUE SEND VIA INSERT/UPDATE/DELETE"
      LIMIT 1

      this solve the problem of .FRM file don't allowing a big definition of ENUM/SET, and add an feature to developer of an avoid of alter table to change enum definition (it can use the external table to define the key-values of enum)

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              Unassigned Unassigned
              rspadim roberto spadim
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                Updated:

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