Change feed processor discriminator

[OpsOwns]

It's possible to block some how receiving unwanted objects from container. For example if I got class StoredDocument and this has got field paylod this is json string and apart from it has property discriminator with custom type of class and i want to in my change feed processor get only indicated types by this property. There is possible block somehow unwanted types because right now i have got something like that.

   public async Task HandleDocuments(IReadOnlyCollection<StoredDocument > documents, CancellationToken token)
        {
            foreach (var document in documents.Where(x => !x.Discriminator.Contains("product", StringComparison.InvariantCulture)))
            {
}
}

[bartelink]

The fundamental constraint is that there is no server-side filtering capability in the endpoint that the CFP uses to obtain its data - it's a "fetch all docs since this continuation token" style query versus a filtered one, and it would be a pretty fundamental change to be able to also supply a filter. Because of the huge variety of filtering and processing that different use cases demand, and the need to allow users to control the parsing (or not) of documents, doing a client-side Where is about as appropriate an API as possible IMO.

Tiny bit related feature idea

[OpsOwns]

So i have to filter out unwanted documents after received documents ?

[bartelink]

Yes, the current API doesn't offer a way for you to specify for filtering to happen, so filtering the supplied list of items is the way to go.