Querying for entities with missing properties in app engine Datastore?
I have a model which looks like this:

    class Example (db.Model) :
     row_num = db.IntegerProperty(required=True)
     updated = db.IntegerProperty()
     ...
     ...

Now when i store values, I may not fill the value for the updated property every time, which implies that in some entities it may not exist. 

I want to construct a datastore query so that i can get all entities of kind Example which do not have the property updated set. 

How do i do this?

p.s. i know i can set a default value and then query on it. But the issue is i have over 3 million entities and updated will be marked only for 1% of them, so i do not want to waste so much of datastore space by setting the rest to 0.



Querying for entities with missing properties in app engine Datastore?
===

I have a model which looks like this:

    class Example (db.Model) :
     row_num = db.IntegerProperty(required=True)
     updated = db.IntegerProperty()
     ...
     ...

Now when i store values, I may not fill the value for the updated property every time, which implies that in some entities it may not exist. 

I want to construct a datastore query so that i can get all entities of kind Example which do not have the property updated set. 

How do i do this?

p.s. i know i can set a default value and then query on it. But the issue is i have over 3 million entities and updated will be marked only for 1% of them, so i do not want to waste so much of datastore space by setting the rest to 0.


