code: def validate(cls, mapper_spec):
      
      super(RawDatastoreInputReader, cls).validate(mapper_spec)
      params = _get_params(mapper_spec)
      entity_kind = params[cls.ENTITY_KIND_PARAM]
      if "." in entity_kind:
        logging.warning(
            ". detected in entity kind %s specified for reader %s."
            "Assuming entity kind contains the dot.",
            entity_kind, cls.__name__)
      if cls.FILTERS_PARAM in params:
        filters = params[cls.FILTERS_PARAM]
        for f in filters:
          if f[1] != "=":
            raise BadReaderParamsError(
                "Only equality filters are supported: %s", f)
docs: Inherit docs.