The StatisticResult uses a special token, the StatisticResult.TOTAL_ROW_TITLE_CELL which it returns for the last row, column 0 (the 'Total' title). This ColumnDescriptor extends renderValue to catch the rendering of that title and apply any boldness or the like (using TotalRendererHelper)
@GODO Note that this ColumnDescriptor also uses the 'trick' of checking for renderer==null to distinguish between normal rendering (on screen) where we do have a renderer, and rendering for export where the renderer is null. This is a bit hacky though and we should probably come up with a nicer generic solution for the ColumnDescriptor/CellRenderer etc. Initial Date: 16.02.2010
@author Stefan
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