class_docstr: Col-based storage.
class_docstr_tok: ["Col-based","storage","."]
code: def seal(self):
      with self._lock:
          if self._sealed:
              return
  
          self._sealed = True
          if self._queue_index or not self._has_all_scalars:
              self._size = self._get_size()
          self._not_empty.notify_all()
          self._not_full.notify_all()
  
imports: import threading
  import copy
  from enum import Enum, auto
  from typing import List, Tuple, Union, Dict, Optional
  from collections import deque, namedtuple
label_desc: Use image node_id 14 for calling the DataQueue obj's underlying member method code with example usage: obj.seal() without return types