code: def _default_groupby():
      return []
  
imports: from typing import Any, Dict, Optional, TypeVar
  from ..public import Api
  from ..public import PythonMongoishQueryGenerator, QueryGenerator, Runs
  from .util import Attr, Base, coalesce, generate_name, nested_get, nested_set
label_desc: Use image node_id 13 for calling the Runset obj's underlying member method code with example usage: obj._default_groupby() and returns: list