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: arrow_assoc.rs
    path of file: ./repos/connector-x/connectorx/src/destinations/arrow2
    
    the code of the file until where you have to start completion: use arrow2::{
    array::*,
    datatypes::{DataType as 
    
    fn push(builder: &mut Self::Builder, value: Self) {
        let mut string_array: Vec<Option<String>> = vec![];
        match value {
            Some(value) => {
                for sub_value in value {
                    string_array.push(Some(sub_value))
                }

                builder.try_push(Some(string_array)).unwrap();
            }
            None => {
                builder.try_push(Some(string_array)).unwrap();
            }
        };
    }