presto-main/src/main/java/io/prestosql/type/ColorOperators.java/ColorOperators/indeterminate
class ColorOperators:    @ScalarOperator(INDETERMINATE)
    @SqlType(StandardTypes.BOOLEAN)
    public static boolean indeterminate(@SqlType(ColorType.NAME) long value, @IsNull boolean isNull)
    {
        return isNull;
    }