@Override
  public String toString() {
    return toStringHelper(this)
        .add("name", name)
        .add("value", isSetToDefault() ? "DEFAULT" : getNonDefaultValue())
        .toString();
  }
Returns the non-default value of the property. This method should be called only if the
property is not set to DEFAULT.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/relational/sql/ast/Property.java