code: private List<Cell> getCellsByTable(String nameSpace) {
          String tName = StringUtils.isEmpty(nameSpace) ? this.nameSpace : nameSpace;
  
          List<Cell> res = cells.get(tName);
  
          if (res == null) {
              res = new ArrayList<>();
              cells.put(tName, res);
          }
  
          return res;
      }
docs: Given the table name, returns the List of Cell object associated to that table.
  
  @param nameSpace the table name.
  @return the List of Cell object associated to that table.