How to get only IDs of documents in Firestore?

Question

Android

How to get only IDs of documents in Firestore without their data for performance and traffic saving.
Because there can be thousands of them, and I won't need their data.

Answer 1

Firestore is not about saving traffic and requests, everything is done there suboptimally so that you switch to a paid plan.
In any case, the query will return all id in the collection, if you want to save money, use:
- A crutch to split data into collections / documents +990 + 991 +992, etc But as far as I understand, there will be thousands of records, so the second option is better.
- VPS with mongodb.
digitalocean.com -> create droplets -> marketplace -> search mongodb $5 per month, Robo 3T data display client