## Uses of Interface
adql.query.operand.UnknownType

- Packages that use UnknownType
  Package | Description
  --- | ---
  adql.query.operand |
  adql.query.operand.function |

- - ### Uses of UnknownType in adql.query.operand

    Classes in adql.query.operand that implement UnknownType
    Modifier and Type | Class | Description
    --- | --- | ---
    `class` | `ADQLColumn` | Represents the complete (literal) reference to a column ({schema(s)}.{table}.{column}).

  - ### Uses of UnknownType in adql.query.operand.function

    Classes in adql.query.operand.function that implement UnknownType
    Modifier and Type | Class | Description
    --- | --- | ---
    `class` | `DefaultUDF` | It represents any function which is not managed by ADQL.
    `class` | `UserDefinedFunction` | Function defined by the user (i.e.