Enum datafusion::logical_expr::AggregateFunction

pub enum AggregateFunction {
    Min,
    Max,
    ArrayAgg,
}

Enum of all built-in aggregate functions

Variants

Min

Minimum

Max

Maximum

ArrayAgg

Aggregation into an array

Implementations

impl AggregateFunction

pub fn name(&self) -> &str

impl AggregateFunction

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

Returns the datatype of the aggregate function given its argument types

This is used to get the returned data type for aggregate expr.

pub fn nullable(&self) -> Result<bool, DataFusionError>

Returns if the return type of the aggregate function is nullable given its argument nullability

impl AggregateFunction

pub fn signature(&self) -> Signature

the signatures supported by the function fun.

Trait Implementations

impl Clone for AggregateFunction

fn clone(&self) -> AggregateFunction

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for AggregateFunction

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

Formats the value using the given formatter.

impl Display for AggregateFunction

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

Formats the value using the given formatter.

impl FromStr for AggregateFunction

type Err = DataFusionError

The associated error which can be returned from parsing.

fn from_str(name: &str) -> Result<AggregateFunction, DataFusionError>

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

impl Hash for AggregateFunction

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

where __H: Hasher,

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 AggregateFunction

type Iterator = AggregateFunctionIter

fn iter() -> AggregateFunctionIter

impl PartialEq for AggregateFunction

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

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

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

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

This method tests less than (for self and other) and is used by the < operator.

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

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

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

This method tests greater than (for self and other) and is used by the > operator.

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

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

impl Eq for AggregateFunction

impl StructuralPartialEq for AggregateFunction