Bug 142939 Invalid interval will cause incorrect group action.
Description: Invalid interval will cause incorrect group action. Steps to reproduce: 1. Insert a list 2. Add a group, key is string type column, set interval to year, range to 3 3. Preview Expected result: Error msg about invald interval and ignore the invalid interval. Actual result: No error msg and only return one group with all datarows.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/QueryExecutor.java
private boolean isPrepared = false;
	private boolean isExecuted = false;
	private Map queryAppContext;
	
	private int nestedLevel = 1;
	
	protected DataSourceRuntime dataSource;
	protected DataSetRuntime dataSet;
	protected IDataSource odiDataSource;
	protected IQuery odiQuery;
	
	protected IQueryService outerResults;
	private IResultIterator odiResult;
	private IExecutorHelper parentHelper;
	private List temporaryComputedColumns = new ArrayList( );
	private static Logger logger = Logger.getLogger( DataEngineImpl.class.getName( ) );
	/**
	 * @param sharedScope
	 * @param baseQueryDefn
	 * @param aggrTable
	 */
	QueryExecutor( Scriptable sharedScope, IBaseQueryDefinition baseQueryDefn,
			AggregateTable aggrTable )
	{
		this.sharedScope = sharedScope;
		this.baseQueryDefn = baseQueryDefn;
		this.aggrTable = aggrTable;
	}
	/**
	 * Provide the actual DataSourceRuntime used for the query.