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#getSharedScope()
	 */
	public Scriptable getSharedScope( )
	{
		return this.sharedScope;
	}
	/**
	 * Gets the Javascript scope for evaluating expressions for this query
	 * 
	 * @return
	 */
	public Scriptable getQueryScope( )
	{
		if ( queryScope == null )
		{
			 
			
			
			
			queryScope = newSubScope( parentScope );
			queryScope.setPrototype( dataSet.getJSDataSetObject( ) );
		}
		return queryScope;
	}
	/**
	 * Creates a subscope within parent scope
	 * @param parentAndProtoScope parent scope. If null, the shared top-level scope is used as parent
	 */
	private Scriptable newSubScope( Scriptable parentAndProtoScope )
	{