class_docstr: Named helper aggregation for counting existence
class_docstr_tok: ["Named","helper","aggregation","for","counting","existence"]
code: def __init__(self, field):
      super().__init__(field, _unwind=False)
  
imports: from datetime import date, datetime
  import typing
  import strawberry
  import fiftyone.core.aggregations
  import fiftyone.core.collections
  import fiftyone.core.fields
  import fiftyone.core.labels
  import fiftyone.core.media
  from fiftyone.core.utils import datetime_to_timestamp
  import fiftyone.core.view
  from fiftyone.server.constants import LIST_LIMIT
  from fiftyone.server.filters import GroupElementFilter, SampleFilter
  from fiftyone.server.inputs import SelectedLabel
  from fiftyone.server.scalars import BSON, BSONArray
  from fiftyone.server.utils import from_dict, meets_type
  import fiftyone.server.view
label_desc: Use image node_id 1 to create a new _CountExists object from inherited base classes: foa with example: obj = _CountExists(field)