Bug 212375 [Automation][Regression]Exception occurs when preview a outputParams["xxx"]
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/PreparedOdaDSQuery.java
protected IDataSource createOdiDataSource( ) throws DataException
		{
			OdaDataSourceRuntime extDS = (OdaDataSourceRuntime) dataSource;
			assert extDS != null;
			
			
		    String driverName = extDS.getExtensionID();
		    if ( driverName == null || driverName.length() == 0 )
		        throw new DataException( ResourceConstants.MISSING_DATASOURCE_EXT_ID,
		        		extDS.getName( ) );
		    
		    
		    Map driverProps = 
		        copyProperties( extDS.getPublicProperties(), 
		        		extDS.getPrivateProperties() );
		    	    
		    
			
			return getDataSource( driverName, driverProps );
		}
		
		/**
		 * @param driverName
		 * @param driverProps
		 * @return
		 * @throws DataException
		 */
		private IDataSource getDataSource( String driverName, Map driverProps )
				throws DataException
		{