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
* @see org.eclipse.birt.data.engine.impl.IQueryExecutor#getJSAggrValueObject()
	 */
	public Scriptable getJSAggrValueObject( )
	{
		if ( aggregates != null )
			return aggregates.getJSAggrValueObject( );
		else
			return null;
	}
	/*
	 * @see org.eclipse.birt.data.engine.impl.IQueryExecutor#getNestedDataSets(int)
	 */
	public DataSetRuntime[] getNestedDataSets( int nestedCount )
	{
		return outerResults.getDataSetRuntime( nestedCount );
	}
	/*
	 * @see org.eclipse.birt.data.engine.impl.IQueryExecutor#getOdiResultSet()
	 */
	public IResultIterator getOdiResultSet( )
	{
		return this.odiResult;
	}
	/**
	 * Resolve parameter bindings and return a Collection of ParameterHints, which merged information obtained
	 * from query parameter binding and the data set parameter definition
	 * 
	 */
	protected Collection resolveDataSetParameters( boolean evaluateValue ) throws DataException
	{