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: hash_utils.rs
    path of file: ./repos/arrow-datafusion/datafusion/common/src
    
    the code of the file until where you have to start completion: // Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NO
    
    fn create_hashes_for_dict_arrays() {
        let strings = [Some("foo"), None, Some("bar"), Some("foo"), None];

        let string_array = Arc::new(strings.iter().cloned().collect::<StringArray>());
        let dict_array = Arc::new(
            strings
                .iter()
                .cloned()
                .collect::<DictionaryArray<Int8Type>>(),
        );

        let random_state = RandomState::with_seeds(0, 0, 0, 0);

        let mut string_hashes = vec![0; strings.len()];
        create_hashes(&[string_array], &random_state, &mut string_hashes).unwrap();

        let mut dict_hashes = vec![0; strings.len()];
        create_hashes(&[dict_array], &random_state, &mut dict_hashes).unwrap();

        // Null values result in a zero hash,
        for (val, hash) in strings.iter().zip(string_hashes.iter()) {
            match val {
                Some(_) => assert_ne!(*hash, 0),
                None => assert_eq!(*hash, 0),
            }
        }

        // same logical values should hash to the same hash value
        assert_eq!(string_hashes, dict_hashes);

        // Same values should map to same hash values
        assert_eq!(strings[1], strings[4]);
        assert_eq!(dict_hashes[1], dict_hashes[4]);
        assert_eq!(strings[0], strings[3]);
        assert_eq!(dict_hashes[0], dict_hashes[3]);

        // different strings should map to different hash values
        assert_ne!(strings[0], strings[2]);
        assert_ne!(dict_hashes[0], dict_hashes[2]);
    }