Function mdbx_estimate_range

pub unsafe extern "C" fn mdbx_estimate_range(
    txn: *const MDBX_txn,
    dbi: u32,
    begin_key: *const iovec,
    begin_data: *const iovec,
    end_key: *const iovec,
    end_data: *const iovec,
    distance_items: *mut isize,
) -> i32

Available on crate feature mdbx only.