class_docstr: schema_info.
class_docstr_tok: ["schema_info","."]
code: def col_names(self):
      return [col.name for col in self._cols]
  
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 3 for calling the _Schema obj's underlying member method code with example usage: obj.col_names() and returns: unknown