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.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/LogUtil.java
{
	}
	
	public static String toString( Object source )
	{
		if ( source instanceof Collection ){
			return toString_Collection(source);
		}
		else if(source instanceof FilterDefinition){
			return toString_FilterDefinition(source);
		}
		else if(source instanceof ConditionalExpression){
			return toString_ConditionalExpression(source);
		}
		else if(source instanceof ScriptExpression){
			return toString_ScriptExpression(source);
		}
		else if(source instanceof InputParameterBinding){
			return toString_InputParameterBinding(source);
		}
		else if(source instanceof GroupDefinition){
			return toString_GroupDefinition(source);
		}
		else if(source instanceof SortDefinition){
			return toString_SortDefinition(source);
		}
		else if(source instanceof QueryDefinition){
			return toString_QueryDefinition(source);
		}
		else if(source instanceof OdaDataSetDesign){