Query a Firestore collection with an in filter (async)

Query a Firestore collection with an in filter (async).

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For detailed documentation that includes this code sample, see the following:

To authenticate to Firestore, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

cities_ref = db.collection("cities")

query = cities_ref.where(filter=FieldFilter("country", "in", ["USA", "Japan"]))
return query

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