Struct Aggregate 

pub struct Aggregate { /* private fields */ }

A summary computed over one column of a group of rows.

Implementations

impl Aggregate

pub fn count(column: usize) -> Self

The number of non-empty cells. Shown as a plain integer, not through the column’s formatter.

pub fn sum(column: usize) -> Self

The sum of the numeric cells: an Int when every one is an integer (and the sum fits), else a Float; Null when there are none.

pub fn min(column: usize) -> Self

The smallest non-empty cell, in natural order.

pub fn max(column: usize) -> Self

The largest non-empty cell, in natural order.

pub fn mean(column: usize) -> Self

The mean of the numeric cells as a Float; Null when there are none.

pub fn custom( column: usize, f: impl Fn(&[&Value]) -> Value + Send + Sync + 'static, ) -> Self

Any summary: f receives the group’s cells of column, in row order.

pub fn column(&self) -> usize

The column this aggregate summarises.

pub fn is_count(&self) -> bool

Whether this is a count, which is displayed without the column’s formatter.

pub fn compute(&self, values: &[&Value]) -> Value

Compute the aggregate over one column’s cells.

pub fn over<R: AsRef<[Value]>>(&self, data: &[R], rows: &[usize]) -> Value

Compute the aggregate over rows (indices into data).

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.