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/api/impl/DataExtractionTask.java
Iterator iter = rsetId2queryIdMapping.entrySet( ).iterator( );
		while ( iter.hasNext( ) )
		{
			Map.Entry entry = (Map.Entry) iter.next( );
			String queryId = (String) entry.getValue( );
			String rsetId = (String) entry.getKey( );
			if ( queryId.equals( id ) )
			{
				return rsetId;
			}
		}
		return null;
	}
	/**
	 * get the rset id from the rset name.
	 * 
	 * @param id
	 * @return
	 */
	protected String rsetId2Name( String id )
	{
		
		Iterator iter = rsetName2IdMapping.entrySet( ).iterator( );
		while ( iter.hasNext( ) )
		{
			Map.Entry entry = (Map.Entry) iter.next( );
			String rsetId = (String) entry.getValue( );
			String rsetName = (String) entry.getKey( );
			if ( rsetId.equals( id ) )
			{