Struct Aggregate 

pub struct Aggregate { /* private fields */ }

One aggregate column of a GroupSpec: what it computes, over which column, and its name in the result.

Implementations

impl Aggregate

pub fn count() -> Self

Rows in the group. Named count unless named.

pub fn sum(column: impl Into<String>) -> Self

Sum of an integer, decimal or float column’s non-null values; null when there are none. Integers and decimals sum exactly (see Groups::to_batch for the result types). Floats sum with compensation for rounding, so the error stays near that of one rounding of the largest partial sum the group has held; the sum is NaN when a value is NaN or both infinities occur, and infinite when one does. Named sum(column).

pub fn min(column: impl Into<String>) -> Self

Smallest non-null value of any column views can sort, in their order: -0.0 equals 0.0, NaN sorts after infinity. Named min(column).

pub fn max(column: impl Into<String>) -> Self

Largest non-null value of any column views can sort, in their order: NaN if the column holds one. Named max(column).

pub fn mean(column: impl Into<String>) -> Self

Mean of an integer, decimal or float column’s non-null values, as a float (NaN and infinities as for sum). Named mean(column).

pub fn named(self, name: impl Into<String>) -> Self

The aggregate, named name in the result.

Trait Implementations

impl Clone for Aggregate

fn clone(&self) -> Self

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 Eq for Aggregate

impl PartialEq for Aggregate

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Aggregate