Struct datafusion::physical_plan::metrics::Label

pub struct Label { /* private fields */ }

name=value pairs identifiying a metric. This concept is called various things in various different systems:

“labels” in prometheus and “tags” in InfluxDB , “attributes” in [open telemetry]https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/datamodel.md, etc.

As the name and value are expected to mostly be constant strings, use a Cow to avoid copying / allocations in this common case.

Implementations

impl Label

pub fn new( name: impl Into<Cow<'static, str>>, value: impl Into<Cow<'static, str>> ) -> Self

Create a new Label

pub fn name(&self) -> &str

Returns the name of this label

pub fn value(&self) -> &str

Returns the value of this label

Trait Implementations

impl Clone for Label

fn clone(&self) -> Label

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Label

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

Formats the value using the given formatter.

impl Display for Label

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

Formats the value using the given formatter.

impl Hash for Label

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

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 PartialEq<Label> for Label

fn eq(&self, other: &Label) -> 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 Eq for Label

impl StructuralEq for Label

impl StructuralPartialEq for Label