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
.get( i )
						.equals( newOperation.getFunctions( ).get( i ) ) )
				{
					
					
					
					
					
					levelHandle.getCrosstab( )
							.setAggregationFunction( getDimensionViewHandle( ).getAxisType( ),
									findMeasureViewHandle( (MeasureHandle) newOperation.getMeasures( )
											.get( i ) ),
									(String) newOperation.getFunctions( )
											.get( i ) );
				}
			}
		}
	}
	private void processSubTotal( List ori, List newList )
			throws SemanticException
	{
		SubOpration oriOperation = new SubOpration( );
		SubOpration newOperation = new SubOpration( );
		for ( int i = 0; i < ori.size( ); i++ )
		{
			SubTotalInfo oriInfo = (SubTotalInfo) ori.get( i );
			SubTotalInfo newInfo = (SubTotalInfo) newList.get( i );
			if ( i == 0 )
			{
				oriOperation.setLevelHandle( oriInfo.getLevel( ) );