Struct Function

pub struct Function<TI, TO> {
    pub function: Arc<dyn Fn(&TI) -> Fallible<TO> + Send + Sync>,
}

A mathematical function.

Fields

function: Arc<dyn Fn(&TI) -> Fallible<TO> + Send + Sync>

Implementations

impl<TI, TO> Function<TI, TO>

pub fn new(function: impl Fn(&TI) -> TO + 'static + Send + Sync) -> Self

pub fn new_fallible( function: impl Fn(&TI) -> Fallible<TO> + 'static + Send + Sync, ) -> Self

pub fn eval(&self, arg: &TI) -> Fallible<TO>

impl<TI: 'static, TO: 'static> Function<TI, TO>

pub fn make_chain<TX: 'static>( function1: &Function<TX, TO>, function0: &Function<TI, TX>, ) -> Function<TI, TO>

impl<TI: 'static, TO: 'static> Function<TI, TO>

pub fn into_poly(self) -> Function<TI, Box<dyn Any>>

Converts this Function into one with polymorphic output.

impl<TI> Function<TI, Box<dyn Any>>

pub fn eval_poly<TO: 'static>(&self, arg: &TI) -> Fallible<TO>

impl Function<ExprPlan, ExprPlan>

pub(crate) fn then_expr( function: impl Fn(Expr) -> Expr + 'static + Send + Sync, ) -> Self

Proof Definition

Return a Function that, when passed a plan, returns the same plan but with the expression extended via function.

pub(crate) fn fill_with(self, value: Expr) -> Self

Proof Definition

Returns a Function that specifies what the function should return if evaluated on an empty partition.

Polars only keeps non-empty partitions in group-by, so this is used to fill missing values after joining with an explicit key set.

impl Function<DslPlan, ExprPlan>

pub(crate) fn from_expr(expr: Expr) -> Self

Proof Definition

Return a Function that, if passed a plan with a wildcard expression, returns the same plan but with expr expression instead.

pub(crate) fn fill_with(self, value: Expr) -> Self

Proof Definition

Returns a Function that specifies what the function should return if evaluated on an empty partition.

Polars only keeps non-empty partitions in group-by, so this is used to fill missing values after joining with an explicit key set.

Trait Implementations

impl<TI, TO> Clone for Function<TI, TO>

fn clone(&self) -> Self

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<TI, TX, TO> Shr<Function<TX, TO>> for Function<TI, TX>

where TI: 'static, TX: 'static, TO: 'static,

type Output = Function<TI, TO>

The resulting type after applying the >> operator.

fn shr(self, rhs: Function<TX, TO>) -> Self::Output

Performs the >> operation.

impl<DI, TX, TO, MI, MO> Shr<Function<TX, TO>> for Measurement<DI, TX, MI, MO>

where DI: 'static + Domain, TX: 'static, TO: 'static, MI: 'static + Metric, MO: 'static + Measure, (DI, MI): MetricSpace,

type Output = Result<Measurement<DI, TO, MI, MO>, Error>

The resulting type after applying the >> operator.

fn shr(self, rhs: Function<TX, TO>) -> Self::Output

Performs the >> operation.

impl<DI, TX, TO, MI, MO> Shr<Function<TX, TO>> for Fallible<Measurement<DI, TX, MI, MO>>

where DI: 'static + Domain, TX: 'static, TO: 'static, MI: 'static + Metric, MO: 'static + Measure, (DI, MI): MetricSpace,

type Output = Result<Measurement<DI, TO, MI, MO>, Error>

The resulting type after applying the >> operator.

fn shr(self, rhs: Function<TX, TO>) -> Self::Output

Performs the >> operation.