Bug 132805 Set descending to outer group will affect inner group.
Description: Set descending to outer group will affect inner group. Steps to reproduce: 1. New a sample datasource and dataset from orders. 2. Drag the dataset to Layout. 3. Add a group on ordernumber, interval 10, descending. 4. Add another group on orderdate, interval day 2, ascending. 5. Preview. Expected result: Data are grouped correctly. Actual result: Inner group didn't work unless you set outer group's sort to asc.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/QueryExecutor.java
private		Scriptable				queryScope;
	private 	boolean 				isPrepared = false;
	private 	boolean					isExecuted = false;
	private		Map						queryAppContext;
	
	private		int						nestedLevel = 1;
	
	protected 	DataSourceRuntime		dataSource;	
	protected	DataSetRuntime			dataSet;
	
	protected 	IDataSource				odiDataSource;
	protected 	IQuery					odiQuery;
	
	
	protected	IQueryService			outerResults;	
	private 	IResultIterator			odiResult;
	private 	IExecutorHelper			parentHelper;
	
	private List temporaryComputedColumns = new ArrayList();
	private static Logger logger = Logger.getLogger( DataEngineImpl.class.getName( ) );
	
	/**
	 * @param sharedScope
	 * @param baseQueryDefn
	 * @param aggrTable
	 */
	QueryExecutor( Scriptable sharedScope, IBaseQueryDefinition baseQueryDefn,
			AggregateTable aggrTable )
	{
		this.sharedScope = sharedScope;