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 	IBaseQueryDefinition 	baseQueryDefn;
	private 	AggregateTable 			aggrTable;
	private 	AggregateCalculator		aggregates;
	
	private 	Scriptable 				sharedScope;
	
	
	private		Scriptable				parentScope;