Struct Aggregate 

pub struct Aggregate {
    pub func: AggFunc,
    pub arg: Option<Box<Expr>>,
    pub distinct: bool,
    pub filter: Option<Box<Expr>>,
}

An aggregate call: function, argument, DISTINCT and FILTER (WHERE ..).

Fields

func: AggFunc

Function.

arg: Option<Box<Expr>>

Argument; None means COUNT(*).

distinct: bool

Aggregate over distinct values only.

filter: Option<Box<Expr>>

Only rows matching this predicate contribute.

Implementations

impl Aggregate

pub fn distinct(self) -> Self

Aggregate distinct values only (COUNT(DISTINCT x)).

pub fn filter(self, predicate: Expr) -> Self

Restrict the rows that contribute (FILTER (WHERE ..)).

Trait Implementations

impl Clone for Aggregate

fn clone(&self) -> Aggregate

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Aggregate

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

Formats the value using the given formatter.

impl From<Aggregate> for Expr

fn from(agg: Aggregate) -> Self

Converts to this type from the input type.

impl PartialEq for Aggregate

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Aggregate