Currently the LocalDataSourceProvider has such support and we can consider introducing the same functionality in the QueryableDataProvider.

Currently when you have null value in a cell, RadPivotGrid considers it as 0. This way when you apply some Aggregate Functions, like Average for example, the result may not be as expected. For example if you have the cells 10, null, 10 RadPivotGrid will show as total the value 6.67 (for Average function). You should be able to exclude null values, so the value 10 will be shown as average for the mentioned cells.

Available in the 2016 R2 release.

Allow filtering through filtering icons in the headers as in the RadGridView control and the WinForms RadPivotGrid.

 Implement: "% of Parent", "% of Parent Row", "% of Parent Column"

Hour, minute, second.

When you apply an average aggregate function (for example via the RadPivotFieldList control) a VerificationException is thrown. The exception message is: "Operation could destabilize the runtime."

All of the functionalities inside the column headers are located in the RadPivotFieldList. Add the same behavior in the RadPivotGrid.

Add support for Hours/Minutes/Seconds steps. Also, add a DayNumber option.

 

Add support for frozen columns. Like in RadGridView or Excel. This way you can scroll the data horizontally while part of the columns are frozen and you can always see them.

We can also consider adding frozen rows like in RadGridView or Excel.

When overriden in a derived class the GetAllNames method receives an empty IEnumerable in the "parentGroupNames" parameter.

In the RadPivotGrid:
Open the Label Filter dialog on a dimension, don't set anything and press OK, then all items are present and nothing is filtered out as expected.
Open the Label filter again and manually specify that the value must equal "xyz" and click OK then it will exclude every item that doesn't match this. Again, this behaviour is what you'd expect.
If you then open the dialog, and delete the "xyz" from the textbox so that the dialog appears exactly as it did originally, and click OK then you won't see any items in your pivot grid. This is because it is now filtering out anything that doesn't have an empty string as the label. This is not what I'd expect.
To remedy this, you can click on the dimension and see that the Label filter is still ticked in the context menu, and click "Clear filter", but this isn't exactly intuitive. 
I'd like the filter to be cleared when you clear the text in the box. 

Setting the Expanded property of the GroupsExpandBehavior assigned to the RowGroupsExpandBehavior property of RadPivotGrid to True, and the RowSubTotalsPosition to None, leads to an error. 

To work this around set the RowSubTotalsPosition to Top. 

Or set the IsExpanded property of the corresponding PivotGroupHeader controls manually.

public MainWindow()
{
InitializeComponent();

// the Opacity is used to avoid the flicker that appears because the groups are rendered just before the collapse logic kicks-in.
this.pivotGrid.Opacity = 0;
this.pivotGrid.Loaded += PivotGrid_Loaded;            
}

private void PivotGrid_Loaded(object sender, RoutedEventArgs e)
{
Dispatcher.BeginInvoke(new Action(() => { 
var headers = this.pivotGrid.ChildrenOfType<PivotGroupHeader>();
foreach (var header in headers)
{
header.IsExpanded = false;
}
this.pivotGrid.Opacity = 1;
}), (DispatcherPriority)3);
}

 Create search functionality in the fields section of the RadPivotFieldList. 

Add filtering support for the aggregate descriptions (PropertyAggregateDescription).

Currently, there is such feature for the row and column group descriptions.
https://docs.telerik.com/devtools/wpf/controls/radpivotgrid/features/localdatasourceprovider/filtering

Scheduled for:
The fix for this issue will be included in R1 2019, scheduled for the mid of January 2019.