Bug 145970 [REGRESSION] Set format in parameter dialog will lose the orginal data set by user.
Reproduce: 1. New a report scalar parameter, "p1", in the initialize dialog, set format to be uppercase. 2. New a data set with query "select * from CLASSICMODELS.CUSTOMERS where CLASSICMODELS.CUSTOMERS.CONTACTFIRSTNAME = ?". And bind the data set parameter to the report parameter "p1". 3. Insert a table into layout view, drag column [CUSTOMERNUMBER], [CONTACTLASTNAME], [CONTACTFIRSTNAME] from Data Explorer into table detail row respectively. 4. Preview. In the pop-up parameter dialog, type "Eric". Press "ok". Actually result: There was no data displayed. Expected result: There is one record whose first name is "Eric" in database.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/service/actionhandler/BirtCacheParameterActionHandler.java
String configFileName = ParameterAccessor
					.getConfigFileName( reportDesignName );
			
			if (configFileName == null)
			{
				handleUpdate( );
				return;
			}
			
			SessionHandle sessionHandle = DesignEngine.newSession( ULocale.US );
			File configFile = new File( configFileName );
			
			if ( configFile != null && configFile.exists( )
					&& configFile.isFile( ) )
			{
				configFile.delete( );
			}
			
			ReportDesignHandle handle = sessionHandle.createDesign( );
			
			Oprand[] op = this.operation.getOprand( );
			if ( op != null )
			{
				for ( int i = 0; i < op.length; i++ )
				{
					ConfigVariable configVar = new ConfigVariable( );
					String paramName = op[i].getName( );
					String paramValue = op[i].getValue( );