Struct csv_pipeline::Transformer

pub struct Transformer { /* private fields */ }

A struct for building a Transform, which you can use with Pipeline::transform_into.

Implementations

impl Transformer

pub fn new(col_name: &str) -> Self

pub fn from_col(self, col_name: &str) -> Self

Specify which column the transform should be based on

pub fn keep_unique(self) -> Box<dyn Transform>

Keep the unique values from this column

pub fn sum<'a, N>(self, init: N) -> Box<dyn Transform + 'a>where
    N: Display + AddAssign + FromStr + Clone + 'a,

Sum the values in this column

pub fn reduce<'a, R, V>(self, reduce: R, init: V) -> Box<dyn Transform + 'a>where
    R: FnMut(V, &str) -> Result<V, Error> + 'a,
    V: Display + Clone + 'a,

Reduce the values from this column into a single value using a closure