Firestore: how to perform a query with inequality / not equals

Question

I want select from Firestore collection just articles written NOT by me.
Is it really so hard?

Every article has field "owner_uid".

Answer 1

For android it should be easy implement with Task Api. Newbie example:

    FirebaseFirestore db = FirebaseFirestore.getInstance();
    Query lessQuery = db.collection("users").whereLessThan("uid", currentUid);
    Query greaterQuery = db.collection("users").whereGreaterThan("uid", currentUid);
    Task lessQuery Task = firstQuery.get();
    Task greaterQuery = secondQuery.get();

    Task combinedTask = Tasks.whenAllSuccess(lessQuery , greaterQuery)
                             .addOnSuccessListener(new OnSuccessListener>() {
        @Override
        public void onSuccess(List