Bug 132515 Expression like "Toltal.rank(Tolta.ave(row[a]),ture,Null,1)" is return an error
Description: Add an expression like "Toltal.rank(Tolta.ave(row[a]),ture,Null,1)" is return an error.The nesting "Toltal" seem not to be work. Step to reproduce: 1.new a datasource and dataset 2.drag the dataset to layout veiw for a table 3.set a group on the table 4.Insert a data into the group header with the expression e.g. "Toltal.rank(Tolta.ave(row[a]),ture,Null,1)" Actual result: An error was thrown out Expected result: It should work correctly in order to support some requirments
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/QueryExecutor.java
* @return
	 */
	abstract protected IResultIterator executeOdiQuery(
			IEventHandler eventHandler ) throws DataException;
	/**
	 * @param context
	 */
	void setAppContext( Map context )
	{
		queryAppContext = context;
	}
	/**
	 * Prepare Executor so that it is ready to execute the query
	 * 
	 * @param outerRts
	 * @param targetScope
	 * @throws DataException
	 */
	void prepareExecution( IQueryResults outerRts, Scriptable targetScope )
			throws DataException
	{
		if ( isPrepared )
			return;
		this.parentScope = targetScope;
		dataSource = findDataSource( );
		if ( outerRts != null )
		{
			outerResults = ( (IQueryService) outerRts );
			if ( outerResults.isClosed( ) )
			{