Function polars::prelude::aggregations::_agg_helper_idx_no_null   
source · pub fn _agg_helper_idx_no_null<T, F>(groups: &GroupsIdx, f: F) -> Serieswhere
    F: Fn((u32, &UnitVec<u32>)) -> <T as PolarsNumericType>::Native + Send + Sync,
    T: PolarsNumericType,
    ChunkedArray<T>: IntoSeries,Expand description
Same helper as _agg_helper_idx but for aggregations that don’t return an Option.