Enum Variable 

pub enum Variable {
    Scalar(Value),
    Frame(Columns<'static>),
}

A variable can be either a scalar value or a dataframe

Variants

Scalar(Value)

A scalar value that can be used directly in expressions

Frame(Columns<'static>)

A dataframe (columns) that requires explicit conversion to scalar

Implementations

impl Variable

pub fn scalar(value: Value) -> Self

Create a scalar variable

pub fn frame(columns: Columns<'static>) -> Self

Create a frame variable

pub fn as_scalar(&self) -> Option<&Value>

Get the scalar value if this is a scalar variable

pub fn as_frame(&self) -> Option<&Columns<'static>>

Get the frame if this is a frame variable

Trait Implementations

impl Clone for Variable

fn clone(&self) -> Variable

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Variable

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.