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: mod.rs
    path of file: ./repos/OxidSQL/src/planner
    
    the code of the file until where you have to start completion: /*
    TODO: Implement a query planner that can take a parsed and analyzed query and produce a plan
          by applying rewrite rules and possibly using 
    
    pub fn get_qualified_name(&self) -> String {
        if let Some(binding) = &self.binding {
            format!("{}.{}", binding, self.attribute.name)
        } else {
            self.attribute.name.clone()
        }
    }