Function polars::export::arrow::compute::substring::substring

pub fn substring(
    array: &dyn Array, 
    start: i64, 
    length: &Option<u64>
) -> Result<Box<dyn Array + 'static, Global>, ArrowError>

This is supported on crate feature compute_substring only.

Returns an ArrayRef with a substring starting from start and with optional length length of each of the elements in array. start can be negative, in which case the start counts from the end of the string. this function errors when the passed array is not a [Large]String array.