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/executor/transform/group/GroupInstanceFilter.java
* @param cx
	 * @param groupFilters
	 * @return
	 * @throws DataException
	 */
	private boolean evaluateFilters( Context cx, List groupFilters )
			throws DataException
	{
		for ( int j = 0; j < groupFilters.size( ); j++ )
		{
			Object result = evaluteFilterExpression( cx,
					(IFilterDefinition) ( groupFilters.get( j ) ) );
			try
			{
				if ( DataTypeUtil.toBoolean( result ).booleanValue( ) == false )
				{
					return false;
				}
			}
			catch ( BirtException e )
			{
				DataException e1 = new DataException( ResourceConstants.DATATYPEUTIL_ERROR,
						e );
				throw e1;
			}
		}
		return true;
	}
	/**
	 * Evaluate a filter expression.