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/api/IViewerReportService.java
* @param docName
	 * @param imageId
	 * @param out
	 * @param options
	 * @throws ReportServiceException
	 */
	void getImage( String docName, String imageId, OutputStream out,
			InputOptions options ) throws ReportServiceException;
	/**
	 * Get a toc node TODO: This method will be changed to return a TOCNode
	 * (engineapi)
	 * 
	 * @param docName
	 * @param tocId
	 * @param options
	 * @return
	 * @throws ReportServiceException
	 */
	ToC getTOC( String docName, String tocId, InputOptions options )
			throws ReportServiceException;
	/**
	 * Get total page count
	 * 
	 * @param docName
	 * @param options
	 * @return
	 * @throws ReportServiceException
	 */
	long getPageCount( String docName, InputOptions options )
			throws ReportServiceException;