Bug 182895 Support sort on Level attribute.
Currently in OLAP engine we only support sort on level key value. We should go ahead to support sort on level attribute value.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/olap/query/view/QueryExecutor.java
}
	/**
	 * 
	 * @param cubeName
	 * @return
	 * @throws IOException
	 * @throws DataException
	 */
	private ICube loadCube( IDocumentManager documentManager, CubeQueryExecutor executor ) throws DataException,
			IOException
	{
		ICube cube = null;
		
		cube = CubeQueryExecutorHelper.loadCube( executor.getCubeQueryDefinition( )
				.getName( ),
				documentManager,
				new StopSign( ) );
		return cube;
	}
	/**
	 * Get the document manager.
	 * 
	 * @param executor
	 * @return
	 * @throws DataException
	 * @throws IOException
	 */
	private IDocumentManager getDocumentManager( CubeQueryExecutor executor )
			throws DataException, IOException
	{