code: public void addCollectionColumnMetadata(CollectionColumnInfo collectionColumnMetadata)
      {
          if (this.collectionColumnMetadatas == null)
          {
              this.collectionColumnMetadatas = new ArrayList<CollectionColumnInfo>();
          }
  
          if (!collectionColumnMetadatas.contains(collectionColumnMetadata))
          {
              collectionColumnMetadatas.add(collectionColumnMetadata);
          }
      }
docs: Adds the collection column metadata.
  
  @param collectionColumnMetadata
  the collection column metadata