class Aws::Rest::Request::QuerystringBuilder

def generate_query_map(ref, value)
  case ref.shape.value.shape
  when StringShape
    query_map_of_string(value)
  when ListShape
    query_map_of_string_list(value)
  else
    msg = 'Only map of string and string list supported'
    raise NotImplementedError, msg
  end
end