Bug 202038 errors occurred when preview the attached design file.
data/org.eclipse.birt.data.tests/test/org/eclipse/birt/data/engine/binding/FeaturesTest.java
IResultIterator it = executeQuery( queryDefn );
		while ( it.next( ) )
		{
			int start1 = it.getStartingGroupLevel( );
			it.getEndingGroupLevel( );
			int start2 = it.getStartingGroupLevel( );
			assertEquals( start1, start2 );
		}
	}
	
	
	
	/**
	 * @param it
	 * @param keyValues
	 * @param restRowCount
	 * @throws DataException
	 * @throws BirtException
	 */
	private void testFindGroup( IResultIterator it, Object[] keyValues,
			int restRowCount ) throws DataException, BirtException
	{
		assertTrue( it.findGroup( keyValues ) );
		int i = 1;
		while ( it.next( ) )
		{
			i++;
		}
		assertEquals( i, restRowCount );
	}