code: def search_types(self) -> Set[SearchKey]:
      search_keys = set()
      for keys_group in self.searchKeys:
          for key in keys_group:
              column = self.column_by_name(key)
              if column:
                  search_keys.add(
                      SearchKey.from_meaning_type(column.meaningType)
                  )
      return search_keys
  
imports: from enum import Enum
  from typing import Dict, List, Optional, Set
  from pydantic import BaseModel
label_desc: Use image node_id 2 for calling the FileMetadata obj's underlying member method code with example usage: obj.search_types() and returns: search_keys