You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: shift.rs
    path of file: ./repos/polars/crates/polars-core/src/chunked_array/ops
    
    the code of the file until where you have to start completion: use num_traits::{abs, clamp};

use crate::prelude::*;

macro_rules! impl_shift_fill {
    
    
    fn shift_and_fill(&self, periods: i64, fill_value: Option<&Series>) -> ArrayChunked {
        // This has its own implementation because a ArrayChunked cannot have a full-null without
        // knowing the inner type
        let periods = clamp(periods, -(self.len() as i64), self.len() as i64);
        let slice_offset = (-periods).max(0);
        let length = self.len() - abs(periods) as usize;
        let mut slice = self.slice(slice_offset, length);

        let fill_length = abs(periods) as usize;
        let mut fill = match fill_value {
            Some(val) => Self::full(self.name(), val, fill_length),
            None => {
                ArrayChunked::full_null_with_dtype(self.name(), fill_length, &self.inner_dtype(), 0)
            },
        };

        if periods < 0 {
            slice.append(&fill).unwrap();
            slice
        } else {
            fill.append(&slice).unwrap();
            fill
        }
    }