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
this.endIndex = end;
		sortKeys = new Object[0];
	}
	/**
	 * Return the start index.
	 * 
	 * @return
	 */
	int getStartIndex( )
	{
		return this.startIndex;
	}
	/**
	 * Return the end index.
	 * 
	 * @return
	 */
	int getEndIndex( )
	{
		return this.endIndex;
	}
	/**
	 * Detect whether the given GroupBoundaryInfo consists of the startIdx and
	 * endIdx that included in current GroupBoundaryInfo instance.
	 * 
	 * @param gbi
	 * @return
	 */
	boolean isInBoundary( GroupBoundaryInfo gbi )
	{