code: @NonNull
    public static Drop dropFunction(@Nullable String keyspace, @NonNull String functionName) {
      return new DefaultDrop(
          keyspace == null ? null : CqlIdentifier.fromCql(keyspace),
          CqlIdentifier.fromCql(functionName),
          "FUNCTION");
    }
docs: Shortcut for {@link #dropFunction(CqlIdentifier, CqlIdentifier)
  dropFunction(CqlIdentifier.fromCql(keyspace),CqlIdentifier.fromCql(functionName)}.