Enum Variable 

pub enum Variable {
    Columns {
        columns: Columns,
    },
    ForIterator {
        columns: Columns,
        index: usize,
    },
    Closure(ClosureValue),
}

A variable can be columnar data, a FOR loop iterator, or a closure.

Variants

Columns

Columnar data. Scalar-ness is derived from shape via columns.is_scalar() (1 column, 1 row).

Fields

columns: Columns

ForIterator

A FOR loop iterator tracking position in a result set

Fields

columns: Columns

index: usize

Closure(ClosureValue)

A closure (anonymous function with captured environment)

Implementations

impl Variable

pub fn scalar(value: Value) -> Self

Create a scalar variable from a single Value.

pub fn scalar_named(name: &str, value: Value) -> Self

Create a scalar variable whose single column is named after the binding (parameter, loop var, or assignment target). Use this when the value is being stored as a named symbol so that later access surfaces the binding name.

pub fn columns(columns: Columns) -> Self

Create a columns variable.

pub fn is_scalar(&self) -> bool

Returns true if this variable represents a scalar value (1 column, 1 row).

pub fn as_columns(&self) -> Option<&Columns>

Extract the inner Columns from any Columns-backed variant.

pub fn into_column(self) -> Result<Column>

Extract the single Column from any Columns-backed variant, consuming self.

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.