langchain/tools/spark_sql/tool.py/QuerySparkSQLTool/_run
class QuerySparkSQLTool:    def _run(
        self,
        query: str,
        run_manager: Optional[CallbackManagerForToolRun] = None,
    ) -> str:
        """Execute the query, return the results or an error message."""
        return self.db.run_no_throw(query)