Repeated/replicated arrays

[martinstuder]

Does arrow support repeated/replicated arrays akin to run-encoded arrays (RunArray) or are there plans for supporting this in the future? What I have in mind is something like

pub struct RepeatedArray {
    data_type: DataType,
    length: usize,
    values: Arc<dyn Array>,
}

where an underlying array would be replicated to a specified target length (similar to what iter().cycle().take(length) would do).