Struct polars_plan::dsl::When

source ·

pub struct When { /* private fields */ }

Expand description

Utility struct for the when-then-otherwise expression.

Represents the state of the expression after when is called.

In this state, then must be called to continue to finish the expression.

Implementations§

source §

impl When

source

pub fn then<E: Into<Expr>>(self, expr: E) -> Then

Add a condition to the when-then-otherwise expression.

Trait Implementations§

source §

impl Clone for When

source §

fn clone(&self) -> When

Returns a copy of the value. Read more

1.0.0 · source§

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

Performs copy-assignment from source. Read more

Auto Trait Implementations§

§

impl !UnwindSafe for When

Blanket Implementations§

source §

impl<T> Any for T
where T: 'static + ?Sized,

source §

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

source §

impl<T> Borrow<T> for T
where T: ?Sized,

source §

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

source §

impl<T> BorrowMut<T> for T
where T: ?Sized,

source §

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

source §

impl<T> CloneToUninit for T
where T: Clone,

source §

default unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)

Performs copy-assignment from self to dst. Read more

source §

impl<T> DynClone for T
where T: Clone,

source §

fn __clone_box(&self, _: Private) -> *mut ()

source §

impl<T> From<T> for T

source §

fn from(t: T) -> T

Returns the argument unchanged.

source §

impl<T, U> Into for T
where U: From<T>,

source §

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

source §

impl<T> IntoEither for T

source §

fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

source §

fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

source §