Enum datafusion_expr::TypeSignature

pub enum TypeSignature {
    Variadic(Vec<DataType>),
    VariadicEqual,
    VariadicAny,
    Uniform(usize, Vec<DataType>),
    Exact(Vec<DataType>),
    Any(usize),
    OneOf(Vec<TypeSignature>),
}

A function’s type signature, which defines the function’s supported argument types.

Variants

Variadic(Vec<DataType>)

arbitrary number of arguments of an common type out of a list of valid types

VariadicEqual

arbitrary number of arguments of an arbitrary but equal type

VariadicAny

arbitrary number of arguments with arbitrary types

Uniform(usize, Vec<DataType>)

fixed number of arguments of an arbitrary but equal type out of a list of valid types

Examples

1. A function of one argument of f64 is Uniform(1, vec![DataType::Float64])
2. A function of one argument of f64 or f32 is Uniform(1, vec![DataType::Float32, DataType::Float64])

Exact(Vec<DataType>)

exact number of arguments of an exact type

Any(usize)

fixed number of arguments of arbitrary types

OneOf(Vec<TypeSignature>)

One of a list of signatures

Trait Implementations

impl Clone for TypeSignature

fn clone(&self) -> TypeSignature

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for TypeSignature

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

Formats the value using the given formatter.

impl Hash for TypeSignature

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq<TypeSignature> for TypeSignature

fn eq(&self, other: &TypeSignature) -> bool

This method tests for self and other values to be equal, and is used by ==.

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

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

impl Eq for TypeSignature

impl StructuralEq for TypeSignature

impl StructuralPartialEq for TypeSignature