Struct AcrossSpec 

pub struct AcrossSpec {
    pub cols: Vec<String>,
    pub transform: AcrossTransform,
    pub name_template: Option<String>,
}

An across() specification: select columns and apply one function.

Fields

cols: Vec<String>

Columns to transform (by name).

transform: AcrossTransform

Transform to apply.

name_template: Option<String>

Optional output name template. None → “{col}_{fn}”. Use {col} and {fn} as placeholders.

Implementations

impl AcrossSpec

pub fn new( cols: impl IntoIterator<Item = impl Into<String>>, transform: AcrossTransform, ) -> Self

pub fn with_template(self, tmpl: impl Into<String>) -> Self

pub fn output_name(&self, col_name: &str) -> String

Generate the output column name for a given input column.