@Override
  public String factoryIdentifier() {
    return IDENTIFIER;
  }
A factory generates {@link MixedFormatDynamicSource} and {@link MixedFormatDynamicSink}
amoro-format-mixed/amoro-mixed-flink/amoro-mixed-flink-common/src/main/java/org/apache/amoro/flink/table/MixedDynamicTableFactory.java