Method keys_iter

arrow-array/src/array/dictionary_array.rs:399–401

Return an iterator over the keys (indexes into the dictionary)

(&self)

    /// Return an iterator over the keys (indexes into the dictionary)
    pub fn keys_iter(&self) -> impl Iterator<Item = Option<usize>> + '_ {
        self.keys.iter().map(|key| key.map(|k| k.as_usize()))
    }

    /// Return the value of `keys` (the dictionary key) at index `i`,
    /// cast to `usize`, `None` if the value at `i` is `NULL`.