Can someone explain the differences between fsexportbigquery, syncBigQuery, initBigQuerySync and setupBigQuerySync

[vpusher]

We are having a hard time to understand the architecture of this extension and we would need some clarification.

The extension comes as 4 cloud functions.
The first one is fsexportbigquery and is triggered by Firestore events whenever a document get created/updated/deleted. All clear.

For the 3 other ones, which are Task Queues, the documentation says the following:

• syncBigQuery: A task-triggered function that gets called on BigQuery sync
• initBigQuerySync: Runs configuration for sycning with BigQuery
• setupBigQuerySync: Runs configuration for sycning with BigQuery

Just reading the function names, it seems syncBigQuery is supposed to do the same job than fsexportbigquery. Is it really ? Also initBigQuerySync and setupBigQuerySync have the same description and same implementation. In what are they different ?

When we look at the metrics, the 3 previous ones are never being triggered/called. Which led us to ask the question here.

Can someone explain the intended design ? Perhaps the doc could benefit from it.