Enum ColumnKeyRef 

pub enum ColumnKeyRef<'a> {
    Int(i64),
    Float(FloatKey),
    Str(&'a str),
    Bool(bool),
}

Borrowed group key — zero-copy reference into column data. Used for BTreeMap lookups without per-row allocation.

Variants

Int(i64)

Float(FloatKey)

Str(&'a str)

Bool(bool)

Implementations

impl<'a> ColumnKeyRef<'a>

pub fn from_column(col: &'a Column, row: usize) -> Self

Borrow a key from a column at a given row — zero allocation.

pub fn to_owned_key(&self) -> GroupKey

Convert to owned GroupKey (clones string if Str variant).

Trait Implementations

impl<'a> Debug for ColumnKeyRef<'a>

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

Formats the value using the given formatter.

impl<'a> Ord for ColumnKeyRef<'a>

fn cmp(&self, other: &ColumnKeyRef<'a>) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl<'a> PartialEq for ColumnKeyRef<'a>

fn eq(&self, other: &ColumnKeyRef<'a>) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<'a> PartialOrd for ColumnKeyRef<'a>

fn partial_cmp(&self, other: &ColumnKeyRef<'a>) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl<'a> Eq for ColumnKeyRef<'a>

impl<'a> StructuralPartialEq for ColumnKeyRef<'a>