Bug 124444 Preview attached file in pdf will display nothing.
Description: Preview attached file in pdf will display nothing. Steps to reproduce: 1. Preview attached design file in pdf Expected result: Report content shows Actual result: Wait for 10 minutes but nothing showed at all
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/data/dte/AbstractDataEngine.java
protected HashMap queryIDMap = new HashMap( );
	protected HashMap mapQueryIDToResultSetIDs = new HashMap( );
	/*
	 * store relations of various query ResultSet. Such as relations between
	 * parent ResultSet and nested query ResultSet.
	 * 
	 * need to be stored in report documents.
	 */
	protected ArrayList queryResultRelations = new ArrayList( );
	protected LinkedList queryResultStack = new LinkedList( );
	protected String reportArchName = null;
	public static final String DATA_META_STREAM = "/Data/hierarchy";
	/*
	 * store expression IDs in the query, which is randomly generated by dte
	 * data engine when preparing the report.
	 * 
	 * queryExpressionIDs need to be stored in DocumentArchive.
	 */
	protected ArrayList queryExpressionIDs = new ArrayList( );
	/**
	 * the logger
	 */
	protected static Logger logger = Logger.getLogger( DteDataEngine.class
			.getName( ) );
	public void prepare( Report report, Map appContext )
	{
		ReportDesignHandle rptHandle = report.getReportDesign( );
		ModelDteApiAdapter adaptor = new ModelDteApiAdapter( context, context
				.getSharedScope( ) );