code: public TColumn getColumnById(long columnId) {
          if (columns == null) {
              return null;
          }
  
          TColumn result = null;
          for (TColumn column : columns) {
              if (column.getId() == columnId) {
                  result = column;
                  break;
              }
          }
          return result;
      }
docs: Get a {@link Column} by ID.
  
  @param columnId the column id
  @return the column by id