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
{
		
		TotalExprBinding result = new TotalExprBinding();
		List l = new ArrayList( );
		for ( int i = 0; i < exprs.size( ); i++ )
		{
			
			Object key = exprs.get( i );
			result.addColumnBindings( l );
			if ( key instanceof String )
			{
				String expr = key == null ? null : key.toString( );
				String newExpr = prepareTotalExpression( expr, l, groupName );
				result.addColumnBindings( l );
				result.addNewExpression( newExpr );
			}
			else if ( key instanceof IConditionalExpression )
			{
				addConditionalExprBindings( result,
						(IConditionalExpression) key,
						l, groupName );
			}
			else if ( key == null )
			{
				result.addNewExpression( null );
			}
		}
		return result;
	}