code: public void setRowsSpanned(final int rowIndex, final int colIndex, final int n)
              throws IOException {
          this.builder.setRowsSpanned(this, this.appender, rowIndex, colIndex, n);
      }
docs: Set a span over rows
  
  @param rowIndex the row index
  @param colIndex the col index
  @param n        the number of rows
  @throws IOException if an error occurs