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: agent_contact_telephone_subreport.rb
    path of file: ./repos/archivesspace/reports/agents/agent_contact_telephone_subreport
    
    the code of the file until where you have to start completion: class AgentContactTelephoneSubreport < AbstractSub
    
	def query_string
		"select
			number,
		    ext,
		    number_type_id as number_type
		from telephone
		where agent_contact_id = #{db.literal(@contact_id)}"
	end