Hi Team, 

Currently, the CompositeFilterDescriptor supports the following two logical operators - and and or.

• https://www.telerik.com/kendo-angular-ui/components/data-query/api/compositefilterdescriptor#logic

I would like to request the addition of a none logical operator.

The Data Query toODataString function currently treats GUIDs as strings, as there is no built-in JavaScript mechanic to distinguish between the two types.

The toODataString function should return a proper formatted OData query string, and a possible solution could be to have a boolean property on the FilterDescriptor to indicate the filter field is to be treated as a GUID, similar to the ignoreCase property that exists now.