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
/**
	 * the execution context
	 */
	protected ExecutionContext context;
	
	/**
	 * the max rows per query
	 */
	protected int maxRows = 0;
	IQueryContext queryContext;
	public ReportQueryBuilder( )
	{
		expressionUtil = new ExpressionUtil( );
		queryBuilder = new QueryBuilderVisitor( );
		
	}	
	/**
	 * @param report
	 *            the entry point to the report design
	 * @param context
	 *            the execution context
	 */
	public ReportQueryBuilder( Report report, ExecutionContext context )
	{
		expressionUtil = new ExpressionUtil( );
		queryBuilder = new QueryBuilderVisitor( );
		this.report = report;
		this.context = context;