docs: def init_defaults(self):
          """
          Sets the default values for this instance
          """
          self.sql = ''
          self.tables = []
          self.joins = []
          self._where = Where()
          self.groups = []
          self.sorters = []
          self._limit = None
          self.table_prefix = ''
          self.is_inner = False
          self.with_tables = []
          self._distinct = False
          self.distinct_ons = []
          self.field_names = []
          self.field_names_pk = None
          self.values = []