code: def query_string(self):
      return self._query_string
  
file_path: evadb/evadb/parser/use_statement.py
imports: from __future__ import annotations
  from evadb.parser.statement import AbstractStatement
  from evadb.parser.types import StatementType
label_desc: Use image node_id 3 for calling the UseStatement obj's underlying member method code with example usage: obj.query_string() and returns: self