Bug 182680 Use feature of new Aggregation framework of Data Engine.
DataEngine will implement new aggregation framework in 2.2.0RC0. After the implementation is finished Engine should go ahead to use new column bindings in definition of map/highlight.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/adapter/ExpressionUtil.java
if( prefix != null )
		{
			ce = new ConditionalExpression( prefix+"("
					+ ce.getExpression( ).getText( ) + ","
					+ ce.getOperand1( ).getText( ) + ")",
					IConditionalExpression.OP_TRUE );
		}
		return ce;
	}
	/**
	 * @param result
	 * @param key
	 */
	private void addConditionalExprBindings( TotalExprBinding result,
			IConditionalExpression key, List bindings, String groupName )
	{
		IConditionalExpression ce = key;
		
		if( groupName!= null )
			ce.setGroupName( groupName );
		
		String bindingName = TOTAL_PREFIX + totalColumnSuffix;
		totalColumnSuffix++;
		ColumnBinding columnBinding = new ColumnBinding( bindingName,
				ce );
		List allColumnBindings = new ArrayList( );
		allColumnBindings.add( columnBinding );
		
		result.addColumnBindings( allColumnBindings );