Function trusted_len_unzip 

pub(crate) unsafe fn trusted_len_unzip<I, P, T>(iterator: I) -> (Buffer, Buffer)
where
    T: ArrowNativeType,
    P: Borrow<Option<T>>,
    I: Iterator<Item = P>,

Creates two [Buffer]s from an iterator of Option. The first buffer corresponds to a bitmap buffer, the second one corresponds to a values buffer.

Safety

The caller must ensure that iterator is TrustedLen.