polars::frame::group_by::aggregations

Function _agg_helper_idx

Source 
pub fn _agg_helper_idx<T, F>(groups: &GroupsIdx, f: F) -> Series
where
    F: Fn((u32, &UnitVec<u32>)) -> Option<<T as PolarsNumericType>::Native> + Send + Sync,
    T: PolarsNumericType,
    ChunkedArray<T>: IntoSeries,
Available on crate feature algorithm_group_by only.
Expand description

Helper that combines the groups into a parallel iterator over (first, all): (u32, &Vec<u32>).