Bug 189363 The aggregation of table should be start with sigma symbol
Description: Follow the spec, after specify a aggregation on a table, the aggregation should be represented by starting with the sigma symbol
xtab/org.eclipse.birt.report.item.crosstab.ui/src/org/eclipse/birt/report/item/crosstab/internal/ui/editors/action/AddSubTotalAction.java
}
			}
			for ( int i = 0; i < oriSize; i++ )
			{
				if ( !oriOperation.getFunctions( )
						.get( i )
						.equals( newOperation.getFunctions( ).get( i ) ) )
				{
					findLevelViewHandle( newOperation.getLevelHandle( ) ).setAggregationFunction( findMeasureViewHandle( (MeasureHandle) newOperation.getMeasures( )
							.get( i ) ),
							(String) newOperation.getFunctions( ).get( i ) );
				}
			}
		}
	}
	private void addGrandTotal( CrosstabReportItemHandle crosstab,
			int axisType, List functions, List measures )
			throws SemanticException
	{
		CrosstabCellHandle cellHandle = crosstab.addGrandTotal( axisType,
				measures,
				functions );
		if ( cellHandle == null )
		{
			return;
		}
		CrosstabUIHelper.CreateGrandTotalLabel( cellHandle );
	}
	private void addAggregationHeader( LevelViewHandle levelView,
			List functions, List measures ) throws SemanticException