Firestore Query for Doubles

Question

I have a simple Firestore query I want to perform but I can't seem to figure it out. Lets say I have a database structured something similar to this:

Groups (collection) 
  groupID
    Members (Array)
      uid1: Double
      uid2: Double
      etc.

I want to query all groups in which uid3 exists.

I want to do something similar to this, but unfortunately this is not possible:

groupRef.where("Members.uid3", "!=", null)

I have looked at this article, but it only provides a solution dealing with Strings. Is there a similar solution for Doubles? Worst case I could use Strings to represent my Doubles and then query.

Answer 1

It turns out that this kind of query is not possible. My solution was to represent the Double as a String and then use the solution in this article.