code: function(cell) {
              if (cell.isColspan) {
                  var colspan = parseInt(api.getAttribute(cell.el, 'colspan') || 1, 10),
                      cType = cell.el.tagName.toLowerCase();
                  if (colspan > 1) {
                      var newCells = this.createCells(cType, colspan -1);
                      insertAfter(cell.el, newCells);
                  }
                  cell.el.removeAttribute('colspan');
              }
          }
docs: Splits merged cell on row to unique cells