code: def _create_filters(col_params, extractors):
    
    result = []
    for col_param, extractor in zip(col_params, extractors):
      a_filter = _create_filter(col_param, extractor)
      if a_filter:
        result.append(a_filter)
    return result
docs: Creates filters for the given col_params.
  
    Args:
      col_params: List of ListSessionGroupsRequest.ColParam protobufs.
      extractors: list of extractor functions of the same length as col_params.
        Each element should extract the column described by the corresponding
        element of col_params.
    Returns:
      A list of filter functions. Each corresponding to a single
      col_params.filter oneof field of _request