code: protected void renderColumnFooterRow(FacesContext facesContext, ResponseWriter writer, UIComponent component,
              String footerStyleClass) throws IOException
      {
          renderColumnHeaderOrFooterRow(facesContext, writer, component, footerStyleClass, false);
      }
docs: Renders the footer row for the columns, which is a separate row from the footer row for the
  <code>UIData</code> footer facet.
  @param facesContext the <code>FacesContext</code>.
  @param writer the <code>ResponseWriter</code>.
  @param component the <code>UIComponent</code> for whom a table is being rendered.
  @param footerStyleClass the styleClass of the footerStyleClass
  @throws IOException if an exception occurs.