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
IResultMetaData metaData = getMetaDateByInstanceID( instanceId );
				if (metaData != null)
				{
					rsetList.add( new ResultSetItem( "InstanceId:" + instanceId, metaData ) );
				}
			}
				
			return rsetList;
		}
		return resultMetaList;
	}
	/**
	 * get the metadata of a result set.
	 * 
	 * @param rsetName
	 * @return
	 */
	protected IResultMetaData getResultMetaData( String rsetName )
	{
		Iterator iter = resultMetaList.iterator( );
		while ( iter.hasNext( ) )
		{
			IResultSetItem rsetItem = (IResultSetItem) iter.next( );
			if ( rsetItem.getResultSetName( ).equals( rsetName ) )
			{
				return rsetItem.getResultMetaData( );
			}
		}
		return null;
	}