Bug 138828 Export data column are disordered
Steps to reproduce: 1.Add a sample data source and a data set with table "CUSTOMERS" 2.Preview in Web Viewer 3.Click "Export data", choose columns "CUSTOMERNAME","PHONE","CITY","STATE" to be exported, click "OK" Expected result: The exported columns is alphabetic order or the same order as selected columns Actual result: The exported columns is disordered. they are "STATE","CITY","CUSTOMERNAME","PHONE".
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/service/ReportEngineService.java
/**
	 * Run report.
	 * 
	 * @param runnable
	 * @param archive
	 * @param documentName
	 * @param locale
	 * @param parameters
	 * @throws RemoteException
	 */
	public void runReport( HttpServletRequest request,
			IReportRunnable runnable, String documentName, Locale locale,
			HashMap parameters ) throws RemoteException
	{
		assert runnable != null;
		
		IRunTask runTask = null;
		synchronized ( this.getClass( ) )
		{
			runTask = engine.createRunTask( runnable );
		}
		runTask.setLocale( locale );
		runTask.setParameterValues( parameters );
		HashMap context = new HashMap( );
		
		context.put( "org.eclipse.birt.data.engine.dataset.cache.option",
				Boolean.TRUE );
		context.put( EngineConstants.APPCONTEXT_BIRT_VIEWER_HTTPSERVET_REQUEST,
				request );
		context.put( EngineConstants.APPCONTEXT_CLASSLOADER_KEY,