Function execute_statement

pub fn execute_statement(
    env: &mut Environment,
    statement: &Box<dyn Statement>,
    data_provider: &Box<dyn DataProvider>,
    gitql_object: &mut GitQLObject,
    alias_table: &mut HashMap<String, String>,
    hidden_selection: &HashMap<String, Vec<String>>,
    has_group_by_statement: bool,
) -> Result<(), String>