Bug 212478 Exception occurs when preview the table including a Autotext
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/data/dte/ReportQueryBuilder.java
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;
	/**
	 * the execution context
	 */
	protected ExecutionContext context;
	/**
	 * the max rows per query
	 */
	protected int maxRows = 0;
	protected IQueryContext queryContext;
	/**
	 * used to register the unresolved query reference.
	 */
	protected Map unresolvedQueryReferences = new HashMap( );