Struct FieldAnnotation 

#[non_exhaustive]
pub struct FieldAnnotation { /* private fields */ }

A per-field annotation carrying arbitrary key-value metadata.

Annotations are emitted in a separate frame (TAG_SCHEMA_ANNOTATIONS) after the schema frame they belong to. They carry metadata such as units, display hints, or semantic-convention labels.

Implementations

impl FieldAnnotation

pub fn new( field_index: u16, key: impl Into<String>, value: impl Into<String>, ) -> Self

Create a new field annotation.

pub fn field_index(&self) -> u16

Index of the field this annotation applies to (0-based, matching the field order in SchemaEntry::fields).

pub fn key(&self) -> &str

Annotation key (e.g. "metrique.unit").

pub fn value(&self) -> &str

Annotation value (e.g. "microseconds").

Trait Implementations

impl Clone for FieldAnnotation

fn clone(&self) -> FieldAnnotation

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for FieldAnnotation

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

Formats the value using the given formatter.

impl PartialEq for FieldAnnotation

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for FieldAnnotation

impl StructuralPartialEq for FieldAnnotation