code: @NonNull
      Collection<TObj> getRowItems(int row) {
          Collection<TObj> result = new LinkedList<>();
          SparseArrayCompat<TObj> array = mData.get(row);
          for (int count = array.size(), i = 0; i < count; i++) {
              int key = array.keyAt(i);
              TObj columnObj = array.get(key);
              if (columnObj != null) {
                  result.add(columnObj);
              }
  
          }
          return result;
      }
docs: Get all row's items
  
  @param row row index
  @return Collection with row's Objects