def METHOD_NAME(self) -> None:
    """
    Validate the query result as a Pandas DataFrame
    """
    # When there are transient errors when executing queries, users will get
    # notified with the error stacktrace which can be avoided by retrying
    df = retry_call(
        self._execute_query,
        exception=AlertQueryError,
        max_tries=app.config["ALERT_REPORTS_QUERY_EXECUTION_MAX_TRIES"],
    )
    if df.empty and self._is_validator_not_null:
        self._result = None
        return
    if df.empty and self._is_validator_operator:
        self._result = 0.0
        return
    rows = df.to_records()
    if self._is_validator_not_null:
        self._validate_not_null(rows)
        return
    self._validate_operator(rows)