Struct MetricDef 

pub struct MetricDef {
    pub name: String,
    pub expression_template: Option<String>,
    pub return_type: DimType,
    pub description: Option<String>,
    pub supports_where: bool,
}

Metric definition — standard SQL aggregate or custom expression.

Fields

name: String

expression_template: Option<String>

If None, uses the standard SQL function (COUNT/SUM/AVG/…). If Some, uses this SQL template with {column} as placeholder. Example: "sumIf({column}, direction='in') - sumIf({column}, direction='out')"

return_type: DimType

description: Option<String>

supports_where: bool

Whether this metric supports conditional aggregation (countIf/sumIf).

Implementations

impl MetricDef

pub fn standard(name: &str) -> Self

pub fn custom(name: &str, expression: &str) -> Self

pub fn with_description(self, desc: &str) -> Self

pub fn with_return_type(self, rt: DimType) -> Self

Trait Implementations

impl Clone for MetricDef

fn clone(&self) -> MetricDef

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for MetricDef

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

Formats the value using the given formatter.