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: aggregation_max_tests.rs
    path of file: ./repos/dozer/dozer-sql/src/aggregation/tests
    
    the code of the file until where you have to start completion: use crate::aggregation::tests::aggregation_tests_utils::{
    delete_exp, delete_field, get_date_field, get_decimal_field, get_duration_field, get_ts_field,
    init_input_schema, init_processor, insert_exp, insert_field, update_exp, update_field, DATE16,
    DATE4, DATE8, FIELD_100_FLOAT, FIELD_100_INT, FIELD_100_UINT, FIELD_200_FLOAT, FIELD_200_INT,
    FIELD_200_UINT, FIELD_50_FLOAT, FIELD_50_INT, FIELD_50_UINT
    
fn test_max_aggregation_float_null() {
    let schema = init_input_schema(Float, "MAX");
    let mut processor = init_processor(
        "SELECT Country, MAX(Salary) \
        FROM Users \
        WHERE Salary >= 1 GROUP BY Country",
        HashMap::from([(DEFAULT_PORT_HANDLE, schema)]),
    )
    .unwrap();

    // Insert NULL for segment Italy
    /*
        Italy, NULL
        -------------
        MAX = NULL
    */
    let mut inp = insert_field(ITALY, FIELD_NULL);
    let mut out = output!(processor, inp);
    let mut exp = vec![insert_exp(ITALY, FIELD_NULL)];
    assert_eq!(out, exp);

    // Insert 100 for segment Italy
    /*
        Italy, NULL
        Italy, 100.0
        -------------
        MAX = 100.0
    */
    inp = insert_field(ITALY, FIELD_100_FLOAT);
    out = output!(processor, inp);
    exp = vec![update_exp(ITALY, ITALY, FIELD_NULL, FIELD_100_FLOAT)];
    assert_eq!(out, exp);

    // Update 100 for segment Italy to NULL
    /*
        Italy, NULL
        Italy, NULL
        -------------
        MAX = 0.0
    */
    inp = update_field(ITALY, ITALY, FIELD_100_FLOAT, FIELD_NULL);
    out = output!(processor, inp);
    exp = vec![update_exp(ITALY, ITALY, FIELD_100_FLOAT, FIELD_NULL)];
    assert_eq!(out, exp);

    // Delete a record
    /*
        Italy, NULL
        -------------
        MAX = 0.0
    */
    inp = delete_field(ITALY, FIELD_NULL);
    out = output!(processor, inp);
    exp = vec![update_exp(ITALY, ITALY, FIELD_NULL, FIELD_NULL)];
    assert_eq!(out, exp);

    // Delete last record
    /*
        -------------
        MAX = 0.0
    */
    inp = delete_field(ITALY, FIELD_NULL);
    out = output!(processor, inp);
    exp = vec![delete_exp(ITALY, FIELD_NULL)];
    assert_eq!(out, exp);
}