How can a multi-property ndb query be successful without a composite index?

Question

I have this entity model:

class ApartCILabel(ndb.Model):
    project_id = ndb.IntegerProperty(indexed=True)
    changeset_ids = ndb.IntegerProperty(repeated=         


        

Answer 1

Queries using only equality filters do not require a composite index to be created. From the documentation:

Cloud Datastore provides built-in, or automatic, indexes for queries of the following forms:

• Queries using only ancestor and equality filters

https://cloud.google.com/datastore/docs/concepts/indexes#index_configuration