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
List dataSetFilters = new ArrayList( );
		    List queryFilters = new ArrayList( );
		    if ( dataSet.getFilters( ) != null )
			{
				dataSetFilters = dataSet.getFilters( );
			}
		    
		    if ( this.baseQueryDefn.getFilters( ) != null )
			{
		    	queryFilters = this.baseQueryDefn.getFilters( );
			}
		    
		    
		    List multipassFilters = prepareFilters( cx, dataSetFilters, queryFilters, temporaryComputedColumns );
		   		   			  
		    		    
		    List computedColumns = null;
		    
			computedColumns = this.dataSet.getComputedColumns( );
			if ( computedColumns == null )
				computedColumns = new ArrayList();
			if ( computedColumns.size() > 0 || temporaryComputedColumns.size( ) > 0 )
			{
				IResultObjectEvent objectEvent = new ComputedColumnHelper( this.dataSet, computedColumns, temporaryComputedColumns);
				odiQuery.addOnFetchEvent( objectEvent );
				this.dataSet.getComputedColumns().addAll(temporaryComputedColumns);
			}
	    	if ( dataSet.getEventHandler() != null )
	    	{