class_docstr: schema_info.
class_docstr_tok: ["schema_info","."]
code: def __init__(self, schema_info: List[Tuple]):
      self._cols = []
      for col in schema_info:
          self._cols.append(_ColumnInfo(*col))
      self._size = len(schema_info)
  
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 1 to create a new _Schema object  with example: obj = _Schema(schema_info)