Method child

arrow-array/src/array/union_array.rs:250–254

Accesses the child array for `type_id`. # Panics Panics if the `type_id` provided is not present in the array's DataType in the `Union`.

(&self, type_id: i8)

    /// Panics if the `type_id` provided is not present in the array's DataType
    /// in the `Union`.
    pub fn child(&self, type_id: i8) -> &ArrayRef {
        assert!((type_id as usize) < self.fields.len());
        let boxed = &self.fields[type_id as usize];
        boxed.as_ref().expect("invalid type id")
    }

    /// Returns the `type_id` for the array slot at `index`.
    ///