QueryBuilder's notEqual doesn't return objects where that field is null

It's in the title, but a concrete example would be. Say we have a model with a String field called field. We have two objects in the database, one of them has field set to an empty String and another one has it set to null. The following query returns the one with the empty field but not the one with null:

box.query().notEqual(Model_.field, "hello world").build().find()

Basic info (please complete the following information):

• ObjectBox version: latest (2.7.1)
• Reproducibility: always
• Device: any
• OS: any

Expected behavior

An object with a particular field being null should match a notEqual which contains any non-null value, instead it doesn't.

Code

        store = MyObjectBox.builder().androidContext(this).buildDefault()
        val box = store.boxFor(Model::class.java)
        box.removeAll()
        Log.d("TEST_LOG", "putting null with id: " + box.put(Model(0, null)))
        Log.d("TEST_LOG", "putting empty with id: " + box.put(Model(0, "")))
        val logString = models.map { it.id }.sorted().joinToString()
        Log.d("TEST_LOG", "models: $logString")

Where Model has a single String field called field

The above code clearly logs only the model with the empty field being returned but not the one with the null value for field. Maybe I'm misunderstanding something but this is a very unintuitive definition of notEqual and nothing in the docs seems to indicate it would behave this way.

Inizia da QueryBuilder.notEqual e segui il percorso della query utilizzato da box.query().notEqual(Model_.field, "hello world").build().find(), concentrandoti su come vengono gestiti i valori null dei campi. Aggiungi un caso di regressione basato sugli esempi di Model e verifica che la query restituisca sia l’oggetto con la stringa vuota sia l’oggetto null.