What do you get if you try the following URL?
http://xxxx:port/sap/opu/odata/sap/ZUI5_SAMPLEUSERINFO_SRV/UserInfoSampleSet$filter=Zuserid eq '123098'
If it returns the 3 results I expect that the filter code hasn't been implemented in the
_GET_ENTITYSET method? i.e. Task 2 in the document.
How to Develop Query Options for an OData Service Using Code-Based Implementation
if you are trying to display in a table you will need to bind to the EntitySet i.e. "/UserInfoSampleSet"
Regards,
Jason
