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
bindingNameRow,
				bindingExprRow );
		IResultIterator it = executeQuery( queryDefn );
		it.next( );
		testFindGroup( it, new Object[]{
			"CHINA"
		}, 8 );
		testFindGroup( it, new Object[]{
				"CHINA", "Beijing"
		}, 8 );
		testFindGroup( it, new Object[]{
				"CHINA", "Shanghai"
		}, 6 );
		testFindGroup( it, new Object[]{
			"US"
		}, 4 );
		testFindGroup( it, new Object[]{
				"US", "New York"
		}, 2 );
		testFindGroup( it, new Object[]{
				"US", "Chicago"
		}, 4 );
		assertFalse( it.findGroup( new Object[]{
				null, null
		} ) );
		assertFalse( it.findGroup( new Object[]{
				null, "Chicago"
		} ) );
		assertFalse( it.findGroup( new Object[]{
				"CHINA", "Chicago"