Bug 211839 String grouping unit type needs to support interval range.
Build ID: I20071101-2000 As Chart has supported, the String grouping unit type can be set interval range, the interval range means that the string group will base on row count distinction. For instance, let's say we have a,b,c,d,e,f,g , and set interval range to 2, the grouping result should be a,c,e,g. Now it is a requirement that DtE support the grouping type.
data/org.eclipse.birt.data.tests/test/org/eclipse/birt/data/engine/binding/DataSetCacheTest.java
private String[] bindingNameRow;
	private String[] bindingExprRow;
	Map appContextMap = new HashMap( );
	ScriptableObject scope;
	private DataEngineImpl myDataEngine;
	/*
	 * @see junit.framework.TestCase#setUp()
	 */
	public void setUp( ) throws Exception
	{
		super.setUp( );
		Context context = Context.enter( );
		scope = context.initStandardObjects( );
		Context.exit( );
		expectedValue = new ArrayList( );
		appContextMap.put( DataEngine.DATASET_CACHE_OPTION, "true" );
		this.appContextMap.put( DataEngine.DATA_SET_CACHE_ROW_LIMIT, null);
		myDataEngine = newDataEngine( );
	}
	/*
	 * @see junit.framework.TestCase#tearDown()
	 */
	public void tearDown( ) throws Exception
	{
		super.tearDown( );
		myDataEngine.clearCache( this.dataSource, this.dataSet );
	}
	/*
	 * @see org.eclipse.birt.data.engine.api.APITestCase#getDataSourceInfo()
	 */