Firestore BigQuery Export: The backfill script doesn't support wildcards

[dotmanish]

• Extension name: _ firestore-bigquery-export
• Extension version: _ latest

Steps to reproduce:

1. Setup Firestore BigQuery Export extension with a wildcard collections path. e.g. objects/{object}/list
2. Attempt to backfill existing collections data to BigQuery via https://github.com/firebase/extensions/blob/master/firestore-bigquery-export/guides/IMPORT_EXISTING_DOCUMENTS.md

Expected result

The backfill script should support the same wildcard capability as the extension.

Actual result

The backfill script gives an error when a wildcard collection path is entered:
The collection path must only contain letters or spaces

[russellwheatley]

Hey @dotmanish, thanks for filing the issue. We are aware of this short coming, but there isn't much we can do about it I'm afraid. Wildcards are allowed in cloud function Firestore triggers, but they aren't possible in Firestore queries.