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
* 
	 * @param servletContext
	 * @param request
	 */
	synchronized public void setEngineContext( ServletContext servletContext,
			HttpServletRequest request )
	{
		if ( engine == null )
		{
			IPlatformContext platformContext = new PlatformServletContext(
					servletContext );
			config.setPlatformContext( platformContext );
			try
			{
				Platform.startup( config );
			}
			catch ( BirtException e )
			{
				
				e.printStackTrace( );
			}
			IReportEngineFactory factory = (IReportEngineFactory) Platform
					.createFactoryObject( IReportEngineFactory.EXTENSION_REPORT_ENGINE_FACTORY );
			engine = factory.createReportEngine( config );
			contextPath = request.getContextPath( );
		}
	}
	/**
	 * Open report design.
	 *