docs: @Override
      protected void onIteration(String containerName, CardinalityEstimatorContainer container) {
          CardinalityEstimatorConfig cardinalityEstimatorConfig = config.findCardinalityEstimatorConfig(containerName);
  
          containerNames.put(container, containerName);
          containerPolicies.put(container, cardinalityEstimatorConfig.getMergePolicyConfig());
      }