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 new ResultMetaData( ( (ICandidateQuery) odiQuery ).getResultClass( ) );
		}
	}
	/*
	 * @see org.eclipse.birt.data.engine.impl.IQueryExecutor#execute()
	 */
	public void execute( IEventHandler eventHandler ) throws DataException
	{
		logger.logp( Level.FINER,
				QueryExecutor.class.getName( ),
				"execute",
				"Start to execute" );
		if ( this.isExecuted )
			return;
		ExecutorHelper helper = new ExecutorHelper( this.getQueryScope() );
		helper.setParent( this.parentHelper );
		eventHandler.setExecutorHelper( helper );
		
		odiResult = executeOdiQuery( eventHandler );
		
		helper.setJSRowObject( this.dataSet.getJSResultRowObject( ) );
		resetComputedColumns( );
		
		this.dataSet.setResultSet( odiResult, false );
		
		aggregates = new AggregateCalculator( this.aggrTable, odiResult );
		
		aggregates.calculate( getQueryScope( ) );
		this.isExecuted = true;
		logger.logp( Level.FINER,