Trait polars::chunked_array::builder::ChunkedBuilder   
source · pub trait ChunkedBuilder<N, T>where
    T: PolarsDataType,{
    // Required methods
    fn append_value(&mut self, val: N);
    fn append_null(&mut self);
    fn finish(self) -> ChunkedArray<T>;
    fn shrink_to_fit(&mut self);
    // Provided method
    fn append_option(&mut self, opt_val: Option<N>) { ... }
}