Bug 122419 Masterpage cannot access Data Set properties
If one references a data set property in the master page, i.e. row["title"], then the viewer displays only 'undefined'.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/data/dte/ReportQueryBuilder.java
{
		/**
		 * query and it's IDs
		 */
		protected HashMap queryIDs;
		/**
		 * a collection of all the queries
		 */
		protected Collection queries;
		
		
		/**
		 * the query stack. The top stores the query that is currently prepared.
		 * Needed because we could have nested queries
		 */
		protected LinkedList queryStack = new LinkedList( );