@Override
  public Configurations clone() {
    Configurations config = new Configurations();
    config.addAll(this);

    return config;
  }
Adds all entries from the given configuration into this configuration. The keys are prepended
with the given prefix.

@param other The configuration whose entries are added to this configuration.
@param prefix The prefix to prepend.
amoro-common/src/main/java/org/apache/amoro/config/Configurations.java