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/src/org/eclipse/birt/data/engine/impl/QueryExecutor.java
private Map queryAppContext;
	
	private int nestedLevel = 1;
	
	protected DataSourceRuntime dataSource;
	protected DataSetRuntime dataSet;
	protected IDataSource odiDataSource;
	protected IQuery odiQuery;
	
	protected IQueryService tabularOuterResults;
	private IResultIterator odiResult;
	private IExecutorHelper parentHelper;
	private DataEngineSession session;
	private List temporaryComputedColumns = new ArrayList( );
	private static Logger logger = Logger.getLogger( QueryExecutor.class.getName( ) );
	/**
	 * @param sharedScope
	 * @param baseQueryDefn
	 * @param aggrTable
	 */
	QueryExecutor( Scriptable sharedScope, IBaseQueryDefinition baseQueryDefn,
			AggregateTable aggrTable, DataEngineSession session )
	{
		Object[] params = {
				sharedScope, baseQueryDefn, aggrTable, session
		};
		logger.entering( QueryExecutor.class.getName( ),
				"QueryExecutor",
				params );
		this.sharedScope = sharedScope;