Struct BaseMeasure 

pub struct BaseMeasure {
    pub name: String,
    pub calculator: Box<dyn Fn(&BTreeMap<String, String>) -> Result<Expr, PolarsError> + Sync + Send>,
    pub aggregation: Option<&'static str>,
    pub precomputefilter: Option<Expr>,
}

Measure is the essentially a Struct of a calculator and a name

Fields

name: String

calculator: Box<dyn Fn(&BTreeMap<String, String>) -> Result<Expr, PolarsError> + Sync + Send>

Main function which performs the calculation Executed in .groupby().agg() context

aggregation: Option<&'static str>

Optional: this field is to restrict aggregation option to certain type only for example where it makes sence to aggregate with “first” and not “sum”

precomputefilter: Option<Expr>

Optional Say you want to compute CSR Delta by Bucket

You are only interested in CSR Buckets, all other would be 0, So we want to avoid unnecessary calculations.

This field is an optional filter on DataFrame, placed PRIOR to the computation

Trait Implementations

impl Default for BaseMeasure

fn default() -> BaseMeasure

Returns the “default value” for a type.

impl From<BaseMeasure> for Measure

fn from(item: BaseMeasure) -> Measure

Converts to this type from the input type.