Struct Metadata 

pub struct Metadata {
    pub type_info: ArrowTypeInfo,
    pub parameters: MetadataParameters,
    /* private fields */
}

Additional data that is sent as part of output messages.

Includes a timestamp, type information, and additional user-provided parameters.

Fields

type_info: ArrowTypeInfo

parameters: MetadataParameters

Implementations

impl Metadata

pub fn new(timestamp: Timestamp, type_info: ArrowTypeInfo) -> Self

pub fn from_parameters( timestamp: Timestamp, type_info: ArrowTypeInfo, parameters: MetadataParameters, ) -> Self

pub fn timestamp(&self) -> Timestamp

pub fn get(&self, key: &str) -> Option<&Parameter>

Returns a raw metadata parameter by key.

This method only accesses user-provided metadata parameters. It does not return fields such as the timestamp or type information. For example, get("timestamp") is not equivalent to Metadata::timestamp.

pub fn get_or<'a, T>(&'a self, key: &str, default: T) -> T

where T: TryFrom<&'a Parameter>,

Returns the parameter for key converted to T, or default if missing or wrong type.

pub fn open_telemetry_context(&self) -> String

Trait Implementations

impl Clone for Metadata

fn clone(&self) -> Metadata

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Metadata

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Metadata

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for Metadata

fn eq(&self, other: &Metadata) -> 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 Serialize for Metadata

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Metadata