code: def from_api_repr(cls, api_repr):
          
          # Handle optional properties with default values
          mode = api_repr.get("mode", "NULLABLE")
          description = api_repr.get("description")
          fields = api_repr.get("fields", ())
          return cls(
              field_type=api_repr["type"].upper(),
              fields=[cls.from_api_repr(f) for f in fields],
              mode=mode.upper(),
              description=description,
              name=api_repr["name"],
          )
docs: Return a ``SchemaField`` object deserialized from a dictionary.
  
          Args:
              api_repr (Mapping[str, str]): The serialized representation
                  of the SchemaField, such as what is output by
                  :meth:`to_api_repr`.
  
          Returns:
              google.cloud.biquery.schema.SchemaField:
                  The ``SchemaField`` object.