moduleArel#### Methods for creating various nodesmoduleFactoryMethodsdefcreate_jointo,constraint=nil,klass=Nodes::InnerJoinklass.new(to,constraint)enddefcreate_string_jointocreate_jointo,nil,Nodes::StringJoinenddefcreate_andclausesNodes::And.newclausesenddefcreate_onexprNodes::On.newexprendendend