Enum BuiltInWindowFunction

pub enum BuiltInWindowFunction {
    FirstValue,
    LastValue,
    NthValue,
}

A window function built in to DataFusion

Variants

FirstValue

returns value evaluated at the row that is the first row of the window frame

LastValue

Returns value evaluated at the row that is the last row of the window frame

NthValue

Returns value evaluated at the row that is the nth row of the window frame (counting from 1); returns null if no such row

Implementations

impl BuiltInWindowFunction

pub fn name(&self) -> &str

impl BuiltInWindowFunction

Returns the datatype of the built-in window function

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

pub fn signature(&self) -> Signature

The signatures supported by the built-in window function fun.

Trait Implementations

impl Clone for BuiltInWindowFunction

fn clone(&self) -> BuiltInWindowFunction

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for BuiltInWindowFunction

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

Formats the value using the given formatter.

impl Display for BuiltInWindowFunction

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

Formats the value using the given formatter.

impl From<BuiltInWindowFunction> for WindowFunctionDefinition

fn from(value: BuiltInWindowFunction) -> Self

Converts to this type from the input type.

impl FromStr for BuiltInWindowFunction

type Err = DataFusionError

The associated error which can be returned from parsing.

fn from_str(name: &str) -> Result<BuiltInWindowFunction>

Parses a string s to return a value of this type.

impl Hash for BuiltInWindowFunction

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 IntoEnumIterator for BuiltInWindowFunction

type Iterator = BuiltInWindowFunctionIter

fn iter() -> BuiltInWindowFunctionIter

impl PartialEq for BuiltInWindowFunction

fn eq(&self, other: &BuiltInWindowFunction) -> 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 PartialOrd for BuiltInWindowFunction

fn partial_cmp(&self, other: &BuiltInWindowFunction) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Eq for BuiltInWindowFunction

impl StructuralPartialEq for BuiltInWindowFunction