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/data/dte/ReportQueryBuilder.java
{
	protected static Logger logger = Logger.getLogger( ReportQueryBuilder.class
			.getName( ) );
	private ExpressionUtil expressionUtil;
	
	private QueryBuilderVisitor queryBuilder;
	
	/**
	 * query and it's IDs
	 */
	protected HashMap queryIDs;
	
	/**
	 * query and result metaData
	 */
	protected HashMap resultMetaData;
	
	/**
	 * a collection of all the queries
	 */
	protected Collection queries;
	/**
	 * entry point to the report
	 */
	protected Report report;