Bug 136246 [regression]Export data exported error column name.
Description: Export data exported error column name. Steps to reproduce: 1. export data in a table, select several columns. Expected result: Selected column name and data are exported. Actual result: No matter what columns you selected, exported columns name always display columns beginning from the first, and then the second, and so on.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/service/ReportEngineService.java
option.setOutputFormat( format );
		option.setMasterPageContent( masterPage );
		IRunAndRenderTask runAndRenderTask = null;
		synchronized ( this.getClass( ) )
		{
			runAndRenderTask = engine.createRunAndRenderTask( runnable );
		}
		runAndRenderTask.setLocale( locale );
		runAndRenderTask.setParameterValues( parameters );
		runAndRenderTask.setRenderOption( option );
		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,
				ReportEngineService.class.getClassLoader( ) );
		if ( !ParameterAccessor.PARAM_FORMAT_PDF.equalsIgnoreCase( format ) )
		{
			context.put( EngineConstants.APPCONTEXT_HTML_RENDER_CONTEXT,
					createHTMLrenderContext( svgFlag ) );
		}
		else
		{
			context.put( EngineConstants.APPCONTEXT_PDF_RENDER_CONTEXT,
					createPDFrenderContext( ) );
		}
		runAndRenderTask.setAppContext( context );
		try