Struct datafusion::physical_plan::metrics::Count

pub struct Count { /* private fields */ }

A counter to record things such as number of input or output rows

Note cloneing counters update the same underlying metrics

Implementations

impl Count

pub fn new() -> Count

create a new counter

pub fn add(&self, n: usize)

Add n to the metric’s value

pub fn value(&self) -> usize

Get the current value

Trait Implementations

impl Clone for Count

fn clone(&self) -> Count

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Count

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

Formats the value using the given formatter.

impl Default for Count

fn default() -> Count

Returns the “default value” for a type.

impl Display for Count

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

Formats the value using the given formatter.

impl PartialEq for Count

fn eq(&self, other: &Count) -> 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.