Struct MetricSchema 

pub struct MetricSchema {
    pub metric_name: String,
    pub tag_keys: Vec<String>,
    pub value_type: DataValueType,
    pub description: Option<String>,
}

Describes the SQL schema of a TSDB metric.

A metric has:

• A mandatory timestamp_ms BIGINT NOT NULL column.
• A mandatory value <DataValueType> NOT NULL column.
• Zero or more VARCHAR tag columns (one per tag key).

The resulting table name is "<metric_name>" (or a sanitised version if the name contains special characters).

Fields

metric_name: String

Name of the metric (used as the SQL table name).

tag_keys: Vec<String>

Ordered list of tag key names.

value_type: DataValueType

SQL type for the value column.

description: Option<String>

Optional human-readable description (stored as a SQL comment).

Implementations

impl MetricSchema

pub fn builder(metric_name: impl Into<String>) -> MetricSchemaBuilder

Create a MetricSchemaBuilder for metric_name.

pub fn table_name(&self) -> String

Return a sanitised SQL table name derived from metric_name.

Non-alphanumeric / non-underscore characters are replaced with _.

pub fn has_tags(&self) -> bool

Return true if this schema has at least one tag column.

pub fn column_count(&self) -> usize

Return the total number of columns (2 fixed + tags).

Trait Implementations

impl Clone for MetricSchema

fn clone(&self) -> MetricSchema

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for MetricSchema

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for MetricSchema

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for MetricSchema

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

where __S: Serializer,

Serialize this value into the given Serde serializer.