4.9 The INFORMATION_SCHEMA COLUMNS_EXTENSIONS Table

The COLUMNS_EXTENSIONS table (available as of MySQL 8.0.21) provides information about column attributes defined for primary and secondary storage engines.

Note

The COLUMNS_EXTENSIONS table is reserved for future use.

The COLUMNS_EXTENSIONS table has these columns:

• TABLE_CATALOG

  The name of the catalog to which the table belongs. This value is always def.

• TABLE_SCHEMA

  The name of the schema (database) to which the table belongs.

• TABLE_NAME

  The name of the table.

• COLUMN_NAME

  The name of the column.

• ENGINE_ATTRIBUTE

  Column attributes defined for the primary storage engine. Reserved for future use.

• SECONDARY_ENGINE_ATTRIBUTE

  Column attributes defined for the secondary storage engine. Reserved for future use.