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/executor/transform/group/GroupCalculationUtil.java
if ( gbi.getStartIndex( ) >= this.getStartIndex( )
				&& gbi.getEndIndex( ) <= this.getEndIndex( ) )
			return true;
		else
			return false;
	}
	/**
	 * Set the sort conditions
	 * 
	 * @param sortKeys
	 * @param sortOrderings
	 */
	void setSortCondition( Object[] sortKeys, boolean[] sortOrderings )
	{
		this.sortKeys = sortKeys;
		this.sortDirections = sortOrderings;
	}
	/**
	 * Return the sort keys array.
	 * 
	 * @return
	 */
	Object[] getSortKeys( )
	{
		return this.sortKeys;
	}
	/**
	 * Return the sort direction array.
	 * 
	 * @return