@Override
  public void setCatName(String catName) {
    this.catName = catName;
    for (PartitionSpecProxy partSpecProxy : partitionSpecProxies) {
      partSpecProxy.setCatName(catName);
    }

  }
Iterator to iterate over all Partitions, across all PartitionSpecProxy instances within the Composite.
standalone-metastore/metastore-common/src/main/java/org/apache/hadoop/hive/metastore/partition/spec/CompositePartitionSpecProxy.java