private static boolean isNullValue(final String value) {
    return value == null || value.equals("null");
  }
When exposing the content of this `PipeParameters` to external sources (such as `show pipes` or
logging), please use this `toString` method to prevent the leakage of private information.
iotdb-api/pipe-api/src/main/java/org/apache/iotdb/pipe/api/customizer/parameter/PipeParameters.java