Hi,

I need help with doing a query that uses a "contains" filter operation. The 
specific use case is that I have to find all users that are have me as a 
friend. The User class has a List<Long> of friends. In JPA I am able to do 
something like this "SELECT FROM User u WHERE u.friends.contains(:myId)". 
However, I haven't figured out how to do this with low-level datastore API. 
The Query.FilterOperation enum doesn't have a CONTAINS constant.

I really want to use low-level datastore API to be able to use paging 
operations. I could do some sort of paging using JPA too, but I don't want 
to do that.

Thanks,
Gaurav

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