Struct datafusion_expr::WindowUDF

pub struct WindowUDF {
    pub name: String,
    pub signature: Signature,
    pub return_type: ReturnTypeFunction,
    pub partition_evaluator_factory: PartitionEvaluatorFactory,
}

Logical representation of a user-defined window function (UDWF) A UDWF is different from a UDF in that it is stateful across batches.

See the documetnation on PartitionEvaluator for more details

Fields

name: String

name

signature: Signature

signature

return_type: ReturnTypeFunction

Return type

partition_evaluator_factory: PartitionEvaluatorFactory

Return the partition evaluator

Implementations

impl WindowUDF

pub fn new( name: &str, signature: &Signature, return_type: &ReturnTypeFunction, partition_evaluator_factory: &PartitionEvaluatorFactory ) -> Self

Create a new WindowUDF

pub fn call( &self, args: Vec<Expr>, partition_by: Vec<Expr>, order_by: Vec<Expr>, window_frame: WindowFrame ) -> Expr

creates a Expr that calls the window function given the partition_by, order_by, and window_frame definition

This utility allows using the UDWF without requiring access to the registry, such as with the DataFrame API.

Trait Implementations

impl Clone for WindowUDF

fn clone(&self) -> WindowUDF

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for WindowUDF

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

Formats the value using the given formatter.

impl Display for WindowUDF

Defines how the WindowUDF is shown to users

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

Formats the value using the given formatter.

impl Hash for WindowUDF

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<WindowUDF> for WindowUDF

fn eq(&self, other: &Self) -> 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 WindowUDF