Enum datafusion_expr::expr::WindowFunctionDefinition

pub enum WindowFunctionDefinition {
    BuiltInWindowFunction(BuiltInWindowFunction),
    AggregateUDF(Arc<AggregateUDF>),
    WindowUDF(Arc<WindowUDF>),
}

WindowFunction Defines which implementation of an aggregate function DataFusion should call.

Variants

BuiltInWindowFunction(BuiltInWindowFunction)

A built in aggregate function that leverages an aggregate function A a built-in window function

AggregateUDF(Arc<AggregateUDF>)

A user defined aggregate function

WindowUDF(Arc<WindowUDF>)

A user defined aggregate function

Implementations

impl WindowFunctionDefinition

pub fn return_type( &self, input_expr_types: &[DataType], _input_expr_nullable: &[bool], ) -> Result<DataType>

Returns the datatype of the window function

pub fn signature(&self) -> Signature

the signatures supported by the function fun.

pub fn name(&self) -> &str

Function’s name for display

Trait Implementations

impl Clone for WindowFunctionDefinition

fn clone(&self) -> WindowFunctionDefinition

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for WindowFunctionDefinition

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

Formats the value using the given formatter.

impl Display for WindowFunctionDefinition

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

Formats the value using the given formatter.

impl From<Arc<AggregateUDF>> for WindowFunctionDefinition

fn from(value: Arc<AggregateUDF>) -> Self

Converts to this type from the input type.

impl From<Arc<WindowUDF>> for WindowFunctionDefinition

fn from(value: Arc<WindowUDF>) -> Self

Converts to this type from the input type.

impl From<BuiltInWindowFunction> for WindowFunctionDefinition

fn from(value: BuiltInWindowFunction) -> Self

Converts to this type from the input type.

impl Hash for WindowFunctionDefinition

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 for WindowFunctionDefinition

fn eq(&self, other: &WindowFunctionDefinition) -> 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 Eq for WindowFunctionDefinition

impl StructuralPartialEq for WindowFunctionDefinition